21487532 has 12 divisors (see below), whose sum is σ = 41021736. Its totient is φ = 9767040.

The previous prime is 21487519. The next prime is 21487547. The reversal of 21487532 is 23578412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244133 + ... + 244220.

It is an arithmetic number, because the mean of its divisors is an integer number (3418478).

Almost surely, 2^21487532 is an apocalyptic number.

21487532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21487532 is a deficient number, since it is larger than the sum of its proper divisors (19534204).

21487532 is a wasteful number, since it uses less digits than its factorization.

21487532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488368 (or 488366 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 21487532 is about 4635.4645937597. The cubic root of 21487532 is about 278.0111273430.

The spelling of 21487532 in words is "twenty-one million, four hundred eighty-seven thousand, five hundred thirty-two".