21234972 has 48 divisors (see below), whose sum is σ = 57238272. Its totient is φ = 6055680.

The previous prime is 21234953. The next prime is 21234973. The reversal of 21234972 is 27943212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2488 + ... + 6975.

It is an arithmetic number, because the mean of its divisors is an integer number (1192464).

Almost surely, 2^21234972 is an apocalyptic number.

21234972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21234972 is an abundant number, since it is smaller than the sum of its proper divisors (36003300).

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

21234972 is a wasteful number, since it uses less digits than its factorization.

21234972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9498 (or 9496 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 21234972 is about 4608.1419248977. The cubic root of 21234972 is about 276.9176033344.

The spelling of 21234972 in words is "twenty-one million, two hundred thirty-four thousand, nine hundred seventy-two".