57212121 has 8 divisors (see below), whose sum is σ = 76456800. Its totient is φ = 38054432.

The previous prime is 57212117. The next prime is 57212167. The reversal of 57212121 is 12121275.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57212121 - 2² = 57212117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57212321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20196 + ... + 22853.

It is an arithmetic number, because the mean of its divisors is an integer number (9557100).

Almost surely, 2^57212121 is an apocalyptic number.

It is an amenable number.

57212121 is a deficient number, since it is larger than the sum of its proper divisors (19244679).

57212121 is a wasteful number, since it uses less digits than its factorization.

57212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43495.

The product of its digits is 280, while the sum is 21.

The square root of 57212121 is about 7563.8694462557. The cubic root of 57212121 is about 385.3269185890.

Adding to 57212121 its reverse (12121275), we get a palindrome (69333396).

The spelling of 57212121 in words is "fifty-seven million, two hundred twelve thousand, one hundred twenty-one".