2256705021 has 4 divisors (see below), whose sum is σ = 3008940032. Its totient is φ = 1504470012.

The previous prime is 2256704959. The next prime is 2256705023. The reversal of 2256705021 is 1205076522.

2256705021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 2256705021 - 2¹³ = 2256696829 is a prime.

It is a super-2 number, since 2×2256705021² = 10185435103613220882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2256705021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256705023) 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, 376117501 + ... + 376117506.

It is an arithmetic number, because the mean of its divisors is an integer number (752235008).

Almost surely, 2^2256705021 is an apocalyptic number.

It is an amenable number.

2256705021 is a deficient number, since it is larger than the sum of its proper divisors (752235011).

2256705021 is an equidigital number, since it uses as much as digits as its factorization.

2256705021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752235010.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 2256705021 is about 47504.7894532751. The cubic root of 2256705021 is about 1311.6710452445.

The spelling of 2256705021 in words is "two billion, two hundred fifty-six million, seven hundred five thousand, twenty-one".