198792986021 has 16 divisors (see below), whose sum is σ = 232358886144. Its totient is φ = 166543263744.

The previous prime is 198792986017. The next prime is 198792986023. The reversal of 198792986021 is 120689297891.

It is a cyclic number.

It is not a de Polignac number, because 198792986021 - 2² = 198792986017 is a prime.

It is a super-2 number, since 2×198792986021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198792986023) 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, 921116 + ... + 1116261.

It is an arithmetic number, because the mean of its divisors is an integer number (14522430384).

Almost surely, 2^198792986021 is an apocalyptic number.

It is an amenable number.

198792986021 is a deficient number, since it is larger than the sum of its proper divisors (33565900123).

198792986021 is a wasteful number, since it uses less digits than its factorization.

198792986021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037700.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The spelling of 198792986021 in words is "one hundred ninety-eight billion, seven hundred ninety-two million, nine hundred eighty-six thousand, twenty-one".