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2120112121 = 7753273457
BaseRepresentation
bin111111001011110…
…0101011111111001
312110202100212002011
41332113211133321
513320222041441
6550213205521
7103352440621
oct17627453771
95422325064
102120112121
11998825686
124b20308a1
1327a31031a
14161803881
15c61db581
hex7e5e57f9

2120112121 has 4 divisors (see below), whose sum is σ = 2120393332. Its totient is φ = 2119830912.

The previous prime is 2120112107. The next prime is 2120112161. The reversal of 2120112121 is 1212110212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2068430400 + 51681721 = 45480^2 + 7189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120112121 - 27 = 2120111993 is a prime.

It is a super-2 number, since 2×21201121212 = 8989750811222237282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120112161) 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, 128976 + ... + 144481.

It is an arithmetic number, because the mean of its divisors is an integer number (530098333).

Almost surely, 22120112121 is an apocalyptic number.

It is an amenable number.

2120112121 is a deficient number, since it is larger than the sum of its proper divisors (281211).

2120112121 is an equidigital number, since it uses as much as digits as its factorization.

2120112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281210.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2120112121 is about 46044.6752730432. The cubic root of 2120112121 is about 1284.6543041978.

Adding to 2120112121 its reverse (1212110212), we get a palindrome (3332222333).

The spelling of 2120112121 in words is "two billion, one hundred twenty million, one hundred twelve thousand, one hundred twenty-one".

Divisors: 1 7753 273457 2120112121