21899982 has 16 divisors (see below), whose sum is σ = 47169360. Its totient is φ = 6738432.

The previous prime is 21899939. The next prime is 21899987. The reversal of 21899982 is 28999812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21899987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140307 + ... + 140462.

It is an arithmetic number, because the mean of its divisors is an integer number (2948085).

Almost surely, 2^21899982 is an apocalyptic number.

21899982 is an abundant number, since it is smaller than the sum of its proper divisors (25269378).

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

21899982 is a wasteful number, since it uses less digits than its factorization.

21899982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280787.

The product of its digits is 186624, while the sum is 48.

The square root of 21899982 is about 4679.7416595363. The cubic root of 21899982 is about 279.7786601110.

The spelling of 21899982 in words is "twenty-one million, eight hundred ninety-nine thousand, nine hundred eighty-two".