18221198899996 has 12 divisors (see below), whose sum is σ = 31887142439040. Its totient is φ = 9110586774560.

The previous prime is 18221198899933. The next prime is 18221198900011. The reversal of 18221198899996 is 69999889112281.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550656 + ... + 6061816.

It is an arithmetic number, because the mean of its divisors is an integer number (2657261869920).

Almost surely, 2^{18221198899996} is an apocalyptic number.

It is an amenable number.

18221198899996 is a deficient number, since it is larger than the sum of its proper divisors (13665943539044).

18221198899996 is a wasteful number, since it uses less digits than its factorization.

18221198899996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6337724 (or 6337722 counting only the distinct ones).

The product of its digits is 725594112, while the sum is 82.

The spelling of 18221198899996 in words is "eighteen trillion, two hundred twenty-one billion, one hundred ninety-eight million, eight hundred ninety-nine thousand, nine hundred ninety-six".