56224021 has 24 divisors (see below), whose sum is σ = 69521760. Its totient is φ = 45208800.

The previous prime is 56224001. The next prime is 56224031. The reversal of 56224021 is 12042265.

It is not a de Polignac number, because 56224021 - 2⁵ = 56223989 is a prime.

It is a super-2 number, since 2×56224021² = 6322281074816882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56223983 and 56224001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56224001) 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, 121731 + ... + 122191.

It is an arithmetic number, because the mean of its divisors is an integer number (2896740).

Almost surely, 2^56224021 is an apocalyptic number.

It is an amenable number.

56224021 is a deficient number, since it is larger than the sum of its proper divisors (13297739).

56224021 is a wasteful number, since it uses less digits than its factorization.

56224021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 56224021 is about 7498.2678666476. The cubic root of 56224021 is about 383.0957205868.

Adding to 56224021 its reverse (12042265), we get a palindrome (68266286).

The spelling of 56224021 in words is "fifty-six million, two hundred twenty-four thousand, twenty-one".