57236021 has 2 divisors, whose sum is σ = 57236022. Its totient is φ = 57236020.

The previous prime is 57235973. The next prime is 57236027. The reversal of 57236021 is 12063275.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37075921 + 20160100 = 6089^2 + 4490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57236021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57236027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28618010 + 28618011.

It is an arithmetic number, because the mean of its divisors is an integer number (28618011).

Almost surely, 2^57236021 is an apocalyptic number.

It is an amenable number.

57236021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57236021 is an equidigital number, since it uses as much as digits as its factorization.

57236021 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 57236021 is about 7565.4491604927. The cubic root of 57236021 is about 385.3805670765.

Adding to 57236021 its reverse (12063275), we get a palindrome (69299296).

The spelling of 57236021 in words is "fifty-seven million, two hundred thirty-six thousand, twenty-one".