21930112 has 16 divisors (see below), whose sum is σ = 43689150. Its totient is φ = 10964992.

The previous prime is 21930107. The next prime is 21930131. The reversal of 21930112 is 21103912.

It can be written as a sum of positive squares in only one way, i.e., 18455616 + 3474496 = 4296^2 + 1864^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 21930112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85537 + ... + 85792.

Almost surely, 2^21930112 is an apocalyptic number.

It is an amenable number.

21930112 is a deficient number, since it is larger than the sum of its proper divisors (21759038).

21930112 is an equidigital number, since it uses as much as digits as its factorization.

21930112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171343 (or 171331 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 21930112 is about 4682.9597478518. The cubic root of 21930112 is about 279.9069078284.

The spelling of 21930112 in words is "twenty-one million, nine hundred thirty thousand, one hundred twelve".