57121121 has 16 divisors (see below), whose sum is σ = 62083584. Its totient is φ = 52413504.

The previous prime is 57121111. The next prime is 57121151. The reversal of 57121121 is 12112175.

It is a happy number.

It is not a de Polignac number, because 57121121 - 2¹⁰ = 57120097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 57121093 and 57121102.

It is not an unprimeable number, because it can be changed into a prime (57121111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56795 + ... + 57791.

It is an arithmetic number, because the mean of its divisors is an integer number (3880224).

Almost surely, 2^57121121 is an apocalyptic number.

It is an amenable number.

57121121 is a deficient number, since it is larger than the sum of its proper divisors (4962463).

57121121 is a wasteful number, since it uses less digits than its factorization.

57121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its digits is 140, while the sum is 20.

The square root of 57121121 is about 7557.8516127270. The cubic root of 57121121 is about 385.1225134360.

Adding to 57121121 its reverse (12112175), we get a palindrome (69233296).

It can be divided in two parts, 57121 and 121, that multiplied together give a square (6911641 = 2629²).

The spelling of 57121121 in words is "fifty-seven million, one hundred twenty-one thousand, one hundred twenty-one".