256460221 has 4 divisors (see below), whose sum is σ = 256511200. Its totient is φ = 256409244.

The previous prime is 256460131. The next prime is 256460227. The reversal of 256460221 is 122064652.

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 256460221 - 2¹¹ = 256458173 is a prime.

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 256460221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256460227) 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, 17001 + ... + 28318.

It is an arithmetic number, because the mean of its divisors is an integer number (64127800).

Almost surely, 2^256460221 is an apocalyptic number.

It is an amenable number.

256460221 is a deficient number, since it is larger than the sum of its proper divisors (50979).

256460221 is an equidigital number, since it uses as much as digits as its factorization.

256460221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50978.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 256460221 is about 16014.3754483277. The cubic root of 256460221 is about 635.3406905549.

The spelling of 256460221 in words is "two hundred fifty-six million, four hundred sixty thousand, two hundred twenty-one".