21732475 has 6 divisors (see below), whose sum is σ = 26948300. Its totient is φ = 17385960.

The previous prime is 21732439. The next prime is 21732481. The reversal of 21732475 is 57423712.

It is a de Polignac number, because none of the positive numbers 2^k-21732475 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 434625 + ... + 434674.

Almost surely, 2^21732475 is an apocalyptic number.

21732475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21732475 is a deficient number, since it is larger than the sum of its proper divisors (5215825).

21732475 is an equidigital number, since it uses as much as digits as its factorization.

21732475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869309 (or 869304 counting only the distinct ones).

The product of its digits is 11760, while the sum is 31.

The square root of 21732475 is about 4661.8102706996. The cubic root of 21732475 is about 279.0635167541.

The spelling of 21732475 in words is "twenty-one million, seven hundred thirty-two thousand, four hundred seventy-five".