21940299 has 12 divisors (see below), whose sum is σ = 31753176. Its totient is φ = 14598432.

The previous prime is 21940291. The next prime is 21940309. The reversal of 21940299 is 99204912.

It is not a de Polignac number, because 21940299 - 2³ = 21940291 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21940291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3207 + ... + 7359.

It is an arithmetic number, because the mean of its divisors is an integer number (2646098).

Almost surely, 2^21940299 is an apocalyptic number.

21940299 is a deficient number, since it is larger than the sum of its proper divisors (9812877).

21940299 is a wasteful number, since it uses less digits than its factorization.

21940299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4746 (or 4743 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 21940299 is about 4684.0472884035. The cubic root of 21940299 is about 279.9502420085.

The spelling of 21940299 in words is "twenty-one million, nine hundred forty thousand, two hundred ninety-nine".