56371021 has 16 divisors (see below), whose sum is σ = 66240000. Its totient is φ = 47950224.

The previous prime is 56371009. The next prime is 56371037. The reversal of 56371021 is 12017365.

It is not a de Polignac number, because 56371021 - 2¹³ = 56362829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56371061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50556 + ... + 51658.

It is an arithmetic number, because the mean of its divisors is an integer number (4140000).

Almost surely, 2^56371021 is an apocalyptic number.

It is an amenable number.

56371021 is a deficient number, since it is larger than the sum of its proper divisors (9868979).

56371021 is a wasteful number, since it uses less digits than its factorization.

56371021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1259 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 56371021 is about 7508.0637317487. The cubic root of 56371021 is about 383.4293031715.

Adding to 56371021 its reverse (12017365), we get a palindrome (68388386).

The spelling of 56371021 in words is "fifty-six million, three hundred seventy-one thousand, twenty-one".