56231021 has 16 divisors (see below), whose sum is σ = 73156608. Its totient is φ = 41910000.

The previous prime is 56230991. The next prime is 56231033. The reversal of 56231021 is 12013265.

It is not a de Polignac number, because 56231021 - 2⁶ = 56230957 is a prime.

It is a super-3 number, since 3×56231021³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 56230984 and 56231002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56231221) 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, 14105 + ... + 17646.

It is an arithmetic number, because the mean of its divisors is an integer number (4572288).

Almost surely, 2^56231021 is an apocalyptic number.

It is an amenable number.

56231021 is a deficient number, since it is larger than the sum of its proper divisors (16925587).

56231021 is a wasteful number, since it uses less digits than its factorization.

56231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31792.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 56231021 is about 7498.7346265887. The cubic root of 56231021 is about 383.1116186479. Note that the first 3 decimals are identical.

Adding to 56231021 its reverse (12013265), we get a palindrome (68244286).

The spelling of 56231021 in words is "fifty-six million, two hundred thirty-one thousand, twenty-one".