57233221 has 2 divisors, whose sum is σ = 57233222. Its totient is φ = 57233220.

The previous prime is 57233219. The next prime is 57233227. The reversal of 57233221 is 12233275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 2842596 = 7375^2 + 1686^2 .

It is a cyclic number.

It is not a de Polignac number, because 57233221 - 2¹ = 57233219 is a prime.

Together with 57233219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57233227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28616610 + 28616611.

It is an arithmetic number, because the mean of its divisors is an integer number (28616611).

Almost surely, 2^57233221 is an apocalyptic number.

It is an amenable number.

57233221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57233221 is an equidigital number, since it uses as much as digits as its factorization.

57233221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 25.

The square root of 57233221 is about 7565.2641064275. The cubic root of 57233221 is about 385.3742826705.

Adding to 57233221 its reverse (12233275), we get a palindrome (69466496).

The spelling of 57233221 in words is "fifty-seven million, two hundred thirty-three thousand, two hundred twenty-one".