57021212 has 12 divisors (see below), whose sum is σ = 100756656. Its totient is φ = 28233600.

The previous prime is 57021191. The next prime is 57021227. The reversal of 57021212 is 21212075.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68789 + ... + 69612.

It is an arithmetic number, because the mean of its divisors is an integer number (8396388).

Almost surely, 2^57021212 is an apocalyptic number.

It is an amenable number.

57021212 is a deficient number, since it is larger than the sum of its proper divisors (43735444).

57021212 is a wasteful number, since it uses less digits than its factorization.

57021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138508 (or 138506 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 57021212 is about 7551.2391036174. The cubic root of 57021212 is about 384.8978466257.

Adding to 57021212 its reverse (21212075), we get a palindrome (78233287).

The spelling of 57021212 in words is "fifty-seven million, twenty-one thousand, two hundred twelve".