55102818221 has 32 divisors (see below), whose sum is σ = 61289654400. Its totient is φ = 49123655680.

The previous prime is 55102818217. The next prime is 55102818223. The reversal of 55102818221 is 12281820155.

It is a happy number.

55102818221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55102818221 - 2² = 55102818217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55102818223) 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, 97873286 + ... + 97873848.

It is an arithmetic number, because the mean of its divisors is an integer number (1915301700).

Almost surely, 2^55102818221 is an apocalyptic number.

It is an amenable number.

55102818221 is a deficient number, since it is larger than the sum of its proper divisors (6186836179).

55102818221 is a wasteful number, since it uses less digits than its factorization.

55102818221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309.

The product of its (nonzero) digits is 12800, while the sum is 35.

The spelling of 55102818221 in words is "fifty-five billion, one hundred two million, eight hundred eighteen thousand, two hundred twenty-one".