55113921 has 12 divisors (see below), whose sum is σ = 80056080. Its totient is φ = 36536280.

The previous prime is 55113913. The next prime is 55113931. The reversal of 55113921 is 12931155.

It is not a de Polignac number, because 55113921 - 2³ = 55113913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55113901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15495 + ... + 18716.

It is an arithmetic number, because the mean of its divisors is an integer number (6671340).

Almost surely, 2^55113921 is an apocalyptic number.

It is an amenable number.

55113921 is a deficient number, since it is larger than the sum of its proper divisors (24942159).

55113921 is a wasteful number, since it uses less digits than its factorization.

55113921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34396 (or 34393 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 55113921 is about 7423.8750662979. The cubic root of 55113921 is about 380.5576323620.

The spelling of 55113921 in words is "fifty-five million, one hundred thirteen thousand, nine hundred twenty-one".