55021372 has 24 divisors (see below), whose sum is σ = 110536160. Its totient is φ = 23474880.

The previous prime is 55021363. The next prime is 55021391. The reversal of 55021372 is 27312055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2122 + ... + 10702.

Almost surely, 2^55021372 is an apocalyptic number.

It is an amenable number.

55021372 is an abundant number, since it is smaller than the sum of its proper divisors (55514788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55021372 is a wasteful number, since it uses less digits than its factorization.

55021372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821 (or 8819 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 55021372 is about 7417.6392470920. The cubic root of 55021372 is about 380.3444983032.

The spelling of 55021372 in words is "fifty-five million, twenty-one thousand, three hundred seventy-two".