256077207421 has 32 divisors (see below), whose sum is σ = 321918105600. Its totient is φ = 198616017600.

The previous prime is 256077207413. The next prime is 256077207461. The reversal of 256077207421 is 124702770652.

It is not a de Polignac number, because 256077207421 - 2³ = 256077207413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256077207461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2084650 + ... + 2204068.

It is an arithmetic number, because the mean of its divisors is an integer number (10059940800).

Almost surely, 2^256077207421 is an apocalyptic number.

It is an amenable number.

256077207421 is a deficient number, since it is larger than the sum of its proper divisors (65840898179).

256077207421 is a wasteful number, since it uses less digits than its factorization.

256077207421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120169.

The product of its (nonzero) digits is 329280, while the sum is 43.

The spelling of 256077207421 in words is "two hundred fifty-six billion, seventy-seven million, two hundred seven thousand, four hundred twenty-one".