21732374 has 4 divisors (see below), whose sum is σ = 32598564. Its totient is φ = 10866186.

The previous prime is 21732353. The next prime is 21732383. The reversal of 21732374 is 47323712.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5433092 + ... + 5433095.

It is an arithmetic number, because the mean of its divisors is an integer number (8149641).

Almost surely, 2^21732374 is an apocalyptic number.

21732374 is a deficient number, since it is larger than the sum of its proper divisors (10866190).

21732374 is a wasteful number, since it uses less digits than its factorization.

21732374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10866189.

The product of its digits is 7056, while the sum is 29.

The square root of 21732374 is about 4661.7994379853. The cubic root of 21732374 is about 279.0630844447.

The spelling of 21732374 in words is "twenty-one million, seven hundred thirty-two thousand, three hundred seventy-four".