18221198899995 has 96 divisors (see below), whose sum is σ = 39922482966912. Its totient is φ = 7481136070656.

The previous prime is 18221198899933. The next prime is 18221198900011. The reversal of 18221198899995 is 59999889112281.

18221198899995 is a `hidden beast` number, since 182 + 2 + 1 + 198 + 89 + 99 + 95 = 666.

It is not a de Polignac number, because 18221198899995 - 2¹⁴ = 18221198883611 is a prime.

It is a super-2 number, since 2×18221198899995² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 59978502 + ... + 60281531.

It is an arithmetic number, because the mean of its divisors is an integer number (415859197572).

Almost surely, 2^{18221198899995} is an apocalyptic number.

18221198899995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18221198899995 is an abundant number, since it is smaller than the sum of its proper divisors (21701284066917).

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

18221198899995 is a wasteful number, since it uses less digits than its factorization.

18221198899995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120260101 (or 120260098 counting only the distinct ones).

The product of its digits is 604661760, while the sum is 81.

The spelling of 18221198899995 in words is "eighteen trillion, two hundred twenty-one billion, one hundred ninety-eight million, eight hundred ninety-nine thousand, nine hundred ninety-five".