56237021 has 2 divisors, whose sum is σ = 56237022. Its totient is φ = 56237020.

The previous prime is 56237009. The next prime is 56237029. The reversal of 56237021 is 12073265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51768025 + 4468996 = 7195^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 56237021 - 2¹⁰ = 56235997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56237029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28118510 + 28118511.

It is an arithmetic number, because the mean of its divisors is an integer number (28118511).

Almost surely, 2^56237021 is an apocalyptic number.

It is an amenable number.

56237021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56237021 is an equidigital number, since it uses as much as digits as its factorization.

56237021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 56237021 is about 7499.1346834151. The cubic root of 56237021 is about 383.1252445073.

The spelling of 56237021 in words is "fifty-six million, two hundred thirty-seven thousand, twenty-one".