56436021 has 24 divisors (see below), whose sum is σ = 84948864. Its totient is φ = 37441440.

The previous prime is 56436013. The next prime is 56436067. The reversal of 56436021 is 12063465.

56436021 is a `hidden beast` number, since 56 + 4 + 3 + 602 + 1 = 666.

It is not a de Polignac number, because 56436021 - 2³ = 56436013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56436011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65425 + ... + 66281.

It is an arithmetic number, because the mean of its divisors is an integer number (3539536).

Almost surely, 2^56436021 is an apocalyptic number.

It is an amenable number.

56436021 is a deficient number, since it is larger than the sum of its proper divisors (28512843).

56436021 is an equidigital number, since it uses as much as digits as its factorization.

56436021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1131 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 56436021 is about 7512.3911639371. The cubic root of 56436021 is about 383.5766207771.

Adding to 56436021 its reverse (12063465), we get a palindrome (68499486).

It can be divided in two parts, 5643 and 6021, that added together give a square (11664 = 108²).

The spelling of 56436021 in words is "fifty-six million, four hundred thirty-six thousand, twenty-one".