55021065 has 32 divisors (see below), whose sum is σ = 96768000. Its totient is φ = 26473920.

The previous prime is 55021039. The next prime is 55021069. The reversal of 55021065 is 56012055.

It is not a de Polignac number, because 55021065 - 2¹⁹ = 54496777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55021069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21736 + ... + 24134.

It is an arithmetic number, because the mean of its divisors is an integer number (3024000).

Almost surely, 2^55021065 is an apocalyptic number.

55021065 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55021065 is a deficient number, since it is larger than the sum of its proper divisors (41746935).

55021065 is a wasteful number, since it uses less digits than its factorization.

55021065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 55021065 is about 7417.6185531476. The cubic root of 55021065 is about 380.3437909055.

The spelling of 55021065 in words is "fifty-five million, twenty-one thousand, sixty-five".