199921128 has 64 divisors (see below), whose sum is σ = 564062400. Its totient is φ = 58490880.

The previous prime is 199921109. The next prime is 199921133. The reversal of 199921128 is 821129991.

It is a self number, because there is not a number n which added to its sum of digits gives 199921128.

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, 5401 + ... + 20712.

It is an arithmetic number, because the mean of its divisors is an integer number (8813475).

Almost surely, 2^199921128 is an apocalyptic number.

It is an amenable number.

199921128 is an abundant number, since it is smaller than the sum of its proper divisors (364141272).

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

199921128 is a wasteful number, since it uses less digits than its factorization.

199921128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26162 (or 26158 counting only the distinct ones).

The product of its digits is 23328, while the sum is 42.

The square root of 199921128 is about 14139.3468024517. The cubic root of 199921128 is about 584.7266631593.

The spelling of 199921128 in words is "one hundred ninety-nine million, nine hundred twenty-one thousand, one hundred twenty-eight".