2256345021 has 8 divisors (see below), whose sum is σ = 3438240064. Its totient is φ = 1289340000.

The previous prime is 2256344963. The next prime is 2256345023. The reversal of 2256345021 is 1205436522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2256345021 - 2⁹ = 2256344509 is a prime.

It is a super-3 number, since 3×2256345021³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2256345021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256345023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53722480 + ... + 53722521.

It is an arithmetic number, because the mean of its divisors is an integer number (429780008).

Almost surely, 2^2256345021 is an apocalyptic number.

2256345021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2256345021 is a deficient number, since it is larger than the sum of its proper divisors (1181895043).

2256345021 is a wasteful number, since it uses less digits than its factorization.

2256345021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107445011.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 2256345021 is about 47501.0002105219. Note that the first 3 decimals coincide. The cubic root of 2256345021 is about 1311.6012935958.

The spelling of 2256345021 in words is "two billion, two hundred fifty-six million, three hundred forty-five thousand, twenty-one".