21109192 has 16 divisors (see below), whose sum is σ = 42624540. Its totient is φ = 9742656.

The previous prime is 21109181. The next prime is 21109201. The reversal of 21109192 is 29190112.

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 4356 = 4594^2 + 66^2 .

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, 101383 + ... + 101590.

Almost surely, 2^21109192 is an apocalyptic number.

It is an amenable number.

21109192 is an abundant number, since it is smaller than the sum of its proper divisors (21515348).

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

21109192 is a wasteful number, since it uses less digits than its factorization.

21109192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202992 (or 202988 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 21109192 is about 4594.4740721872. The cubic root of 21109192 is about 276.3697697319.

The spelling of 21109192 in words is "twenty-one million, one hundred nine thousand, one hundred ninety-two".