21984292 has 24 divisors (see below), whose sum is σ = 44180640. Its totient is φ = 9466560.

The previous prime is 21984257. The next prime is 21984307. The reversal of 21984292 is 29248912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12313 + ... + 13984.

It is an arithmetic number, because the mean of its divisors is an integer number (1840860).

Almost surely, 2^21984292 is an apocalyptic number.

21984292 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21984292 is an abundant number, since it is smaller than the sum of its proper divisors (22196348).

21984292 is a wasteful number, since it uses less digits than its factorization.

21984292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26331 (or 26329 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 21984292 is about 4688.7409823960. The cubic root of 21984292 is about 280.1372286513.

The spelling of 21984292 in words is "twenty-one million, nine hundred eighty-four thousand, two hundred ninety-two".