21732316 has 6 divisors (see below), whose sum is σ = 38031560. Its totient is φ = 10866156.

The previous prime is 21732253. The next prime is 21732317. The reversal of 21732316 is 61323712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21732317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2716536 + ... + 2716543.

Almost surely, 2^21732316 is an apocalyptic number.

It is an amenable number.

21732316 is a deficient number, since it is larger than the sum of its proper divisors (16299244).

21732316 is a wasteful number, since it uses less digits than its factorization.

21732316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433083 (or 5433081 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 21732316 is about 4661.7932172073. The cubic root of 21732316 is about 279.0628361872.

It can be divided in two parts, 2173 and 2316, that added together give a square (4489 = 67²).

The spelling of 21732316 in words is "twenty-one million, seven hundred thirty-two thousand, three hundred sixteen".