18900220022021 has 16 divisors (see below), whose sum is σ = 20574007104000. Its totient is φ = 17258027125248.

The previous prime is 18900220022017. The next prime is 18900220022077. The reversal of 18900220022021 is 12022002200981.

It is a happy number.

It is not a de Polignac number, because 18900220022021 - 2² = 18900220022017 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 (18900220022081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1104221 + ... + 6246578.

It is an arithmetic number, because the mean of its divisors is an integer number (1285875444000).

Almost surely, 2^{18900220022021} is an apocalyptic number.

It is an amenable number.

18900220022021 is a deficient number, since it is larger than the sum of its proper divisors (1673787081979).

18900220022021 is a wasteful number, since it uses less digits than its factorization.

18900220022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7352948.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 18900220022021 in words is "eighteen trillion, nine hundred billion, two hundred twenty million, twenty-two thousand, twenty-one".