55021086 has 32 divisors (see below), whose sum is σ = 122821920. Its totient is φ = 18257472.

The previous prime is 55021073. The next prime is 55021097. The reversal of 55021086 is 68012055.

Added to its reverse (68012055) it gives a triangular number (123033141 = T₁₅₆₈₆).

55021086 is a `hidden beast` number, since 550 + 2 + 108 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10396 + ... + 14768.

It is an arithmetic number, because the mean of its divisors is an integer number (3838185).

Almost surely, 2^55021086 is an apocalyptic number.

55021086 is an abundant number, since it is smaller than the sum of its proper divisors (67800834).

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

55021086 is a wasteful number, since it uses less digits than its factorization.

55021086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4617 (or 4611 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 55021086 is about 7417.6199686962. The cubic root of 55021086 is about 380.3438392944.

Adding to 55021086 its reverse (68012055), we get a triangular number (123033141 = T₁₅₆₈₆).

The spelling of 55021086 in words is "fifty-five million, twenty-one thousand, eighty-six".