2056512121 has 4 divisors (see below), whose sum is σ = 2082544000. Its totient is φ = 2030480244.

The previous prime is 2056512113. The next prime is 2056512163. The reversal of 2056512121 is 1212156502.

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 2056512121 - 2³ = 2056512113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2056512181) 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, 13015821 + ... + 13015978.

It is an arithmetic number, because the mean of its divisors is an integer number (520636000).

Almost surely, 2^2056512121 is an apocalyptic number.

It is an amenable number.

2056512121 is a deficient number, since it is larger than the sum of its proper divisors (26031879).

2056512121 is an equidigital number, since it uses as much as digits as its factorization.

2056512121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26031878.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 2056512121 is about 45348.7830156444. The cubic root of 2056512121 is about 1271.6778041674.

Adding to 2056512121 its reverse (1212156502), we get a palindrome (3268668623).

The spelling of 2056512121 in words is "two billion, fifty-six million, five hundred twelve thousand, one hundred twenty-one".