256202277421 has 4 divisors (see below), whose sum is σ = 256224400192. Its totient is φ = 256180154652.

The previous prime is 256202277407. The next prime is 256202277427. The reversal of 256202277421 is 124772202652.

256202277421 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 a cyclic number.

It is not a de Polignac number, because 256202277421 - 2⁹ = 256202276909 is a prime.

It is a super-2 number, since 2×256202277421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256202277427) 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 3 ways as a sum of consecutive naturals, for example, 11044005 + ... + 11067178.

It is an arithmetic number, because the mean of its divisors is an integer number (64056100048).

Almost surely, 2^256202277421 is an apocalyptic number.

It is an amenable number.

256202277421 is a deficient number, since it is larger than the sum of its proper divisors (22122771).

256202277421 is a wasteful number, since it uses less digits than its factorization.

256202277421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22122770.

The product of its (nonzero) digits is 188160, while the sum is 40.

The spelling of 256202277421 in words is "two hundred fifty-six billion, two hundred two million, two hundred seventy-seven thousand, four hundred twenty-one".