21930315 has 16 divisors (see below), whose sum is σ = 38278656. Its totient is φ = 10632800.

The previous prime is 21930283. The next prime is 21930329. The reversal of 21930315 is 51303912.

It is a happy number.

It is not a de Polignac number, because 21930315 - 2⁵ = 21930283 is a prime.

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, 66291 + ... + 66620.

It is an arithmetic number, because the mean of its divisors is an integer number (2392416).

Almost surely, 2^21930315 is an apocalyptic number.

21930315 is a deficient number, since it is larger than the sum of its proper divisors (16348341).

21930315 is a wasteful number, since it uses less digits than its factorization.

21930315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132930.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 21930315 is about 4682.9814221284. The cubic root of 21930315 is about 279.9077714952.

The spelling of 21930315 in words is "twenty-one million, nine hundred thirty thousand, three hundred fifteen".