199921205904 has 80 divisors (see below), whose sum is σ = 597715077120. Its totient is φ = 56397294720.

The previous prime is 199921205899. The next prime is 199921205933. The reversal of 199921205904 is 409502129991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3739302 + ... + 3792389.

It is an arithmetic number, because the mean of its divisors is an integer number (7471438464).

Almost surely, 2^199921205904 is an apocalyptic number.

199921205904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

199921205904 is an abundant number, since it is smaller than the sum of its proper divisors (397793871216).

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

199921205904 is a wasteful number, since it uses less digits than its factorization.

199921205904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7531788 (or 7531782 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 51.

The spelling of 199921205904 in words is "one hundred ninety-nine billion, nine hundred twenty-one million, two hundred five thousand, nine hundred four".