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11111101021 = 83133868687
BaseRepresentation
bin10100101100100010…
…11111001001011101
31001200100111102012001
422112101133021131
5140223420213041
65034313242301
7542225541346
oct122621371135
931610442161
1011111101021
114791a21719
1221a1103391
131080c56bb7
147759510cd
154506d8131
hex29645f25d

11111101021 has 4 divisors (see below), whose sum is σ = 11244969792. Its totient is φ = 10977232252.

The previous prime is 11111101019. The next prime is 11111101037. The reversal of 11111101021 is 12010111111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11111101021 - 21 = 11111101019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111100989 and 11111101007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111101061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66934261 + ... + 66934426.

It is an arithmetic number, because the mean of its divisors is an integer number (2811242448).

Almost surely, 211111101021 is an apocalyptic number.

It is an amenable number.

11111101021 is a deficient number, since it is larger than the sum of its proper divisors (133868771).

11111101021 is an equidigital number, since it uses as much as digits as its factorization.

11111101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133868770.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 11111101021 its reverse (12010111111), we get a palindrome (23121212132).

The spelling of 11111101021 in words is "eleven billion, one hundred eleven million, one hundred one thousand, twenty-one".

Divisors: 1 83 133868687 11111101021