256421227 has 8 divisors (see below), whose sum is σ = 267736320. Its totient is φ = 245120040.

The previous prime is 256421213. The next prime is 256421239. The reversal of 256421227 is 722124652.

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

It is a cyclic number.

It is not a de Polignac number, because 256421227 - 2¹⁵ = 256388459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256421027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56202 + ... + 60592.

It is an arithmetic number, because the mean of its divisors is an integer number (33467040).

Almost surely, 2^256421227 is an apocalyptic number.

256421227 is a deficient number, since it is larger than the sum of its proper divisors (11315093).

256421227 is a wasteful number, since it uses less digits than its factorization.

256421227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6953.

The product of its digits is 13440, while the sum is 31.

The square root of 256421227 is about 16013.1579333996. The cubic root of 256421227 is about 635.3084883801.

Adding to 256421227 its reverse (722124652), we get a palindrome (978545879).

The spelling of 256421227 in words is "two hundred fifty-six million, four hundred twenty-one thousand, two hundred twenty-seven".