55021008 has 40 divisors (see below), whose sum is σ = 162443968. Its totient is φ = 15720192.

The previous prime is 55020997. The next prime is 55021009. The reversal of 55021008 is 80012055.

55021008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55021008² = 6054622642672128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55021009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81541 + ... + 82212.

Almost surely, 2^55021008 is an apocalyptic number.

It is an amenable number.

55021008 is an abundant number, since it is smaller than the sum of its proper divisors (107422960).

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

55021008 is a wasteful number, since it uses less digits than its factorization.

55021008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163771 (or 163765 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 55021008 is about 7417.6147109431. The cubic root of 55021008 is about 380.3436595643.

The spelling of 55021008 in words is "fifty-five million, twenty-one thousand, eight".