191421924 has 24 divisors (see below), whose sum is σ = 462053760. Its totient is φ = 61606944.

The previous prime is 191421917. The next prime is 191421959. The reversal of 191421924 is 429124191.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274684 + ... + 275379.

It is an arithmetic number, because the mean of its divisors is an integer number (19252240).

Almost surely, 2^191421924 is an apocalyptic number.

It is an amenable number.

191421924 is an abundant number, since it is smaller than the sum of its proper divisors (270631836).

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

191421924 is a wasteful number, since it uses less digits than its factorization.

191421924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550099 (or 550097 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 191421924 is about 13835.5312149552. The cubic root of 191421924 is about 576.3202670120.

The spelling of 191421924 in words is "one hundred ninety-one million, four hundred twenty-one thousand, nine hundred twenty-four".