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111120021 = 3233736637
BaseRepresentation
bin1101001111110…
…00111010010101
321202002111000100
412213320322111
5211421320041
615005404313
72516335035
oct647707225
9252074010
10111120021
11577a7131
1231269699
131a0380bc
1410a878c5
159b4e6b6
hex69f8e95

111120021 has 12 divisors (see below), whose sum is σ = 160987372. Its totient is φ = 73858176.

The previous prime is 111120013. The next prime is 111120029. The reversal of 111120021 is 120021111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111120013) and next prime (111120029).

It can be written as a sum of positive squares in 2 ways, for example, as 34644996 + 76475025 = 5886^2 + 8745^2 .

It is not a de Polignac number, because 111120021 - 23 = 111120013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111119985 and 111120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15286 + ... + 21351.

Almost surely, 2111120021 is an apocalyptic number.

It is an amenable number.

111120021 is a deficient number, since it is larger than the sum of its proper divisors (49867351).

111120021 is a wasteful number, since it uses less digits than its factorization.

111120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36980 (or 36977 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 111120021 is about 10541.3481585611. The cubic root of 111120021 is about 480.7627067091.

Adding to 111120021 its reverse (120021111), we get a palindrome (231141132).

It can be divided in two parts, 111 and 120021, that multiplied together give a palindrome (13322331).

The spelling of 111120021 in words is "one hundred eleven million, one hundred twenty thousand, twenty-one".

Divisors: 1 3 9 337 1011 3033 36637 109911 329733 12346669 37040007 111120021