56560021 has 8 divisors (see below), whose sum is σ = 65307200. Its totient is φ = 47979648.

The previous prime is 56559989. The next prime is 56560057. The reversal of 56560021 is 12006565.

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 56560021 - 2⁵ = 56559989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56560421) 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, 40971 + ... + 42328.

It is an arithmetic number, because the mean of its divisors is an integer number (8163400).

Almost surely, 2^56560021 is an apocalyptic number.

It is an amenable number.

56560021 is a deficient number, since it is larger than the sum of its proper divisors (8747179).

56560021 is an equidigital number, since it uses as much as digits as its factorization.

56560021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83403.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 56560021 is about 7520.6396669432. The cubic root of 56560021 is about 383.8573440187.

Adding to 56560021 its reverse (12006565), we get a palindrome (68566586).

The spelling of 56560021 in words is "fifty-six million, five hundred sixty thousand, twenty-one".