56505421 has 32 divisors (see below), whose sum is σ = 69672960. Its totient is φ = 44822400.

The previous prime is 56505413. The next prime is 56505437. The reversal of 56505421 is 12450565.

It is not a de Polignac number, because 56505421 - 2³ = 56505413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56505421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56505451) 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, 795816 + ... + 795886.

It is an arithmetic number, because the mean of its divisors is an integer number (2177280).

Almost surely, 2^56505421 is an apocalyptic number.

It is an amenable number.

56505421 is a deficient number, since it is larger than the sum of its proper divisors (13167539).

56505421 is a wasteful number, since it uses less digits than its factorization.

56505421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 56505421 is about 7517.0087800933. The cubic root of 56505421 is about 383.7337858449.

Adding to 56505421 its reverse (12450565), we get a palindrome (68955986).

The spelling of 56505421 in words is "fifty-six million, five hundred five thousand, four hundred twenty-one".