21489932 has 6 divisors (see below), whose sum is σ = 37607388. Its totient is φ = 10744964.

The previous prime is 21489917. The next prime is 21489943. The reversal of 21489932 is 23998412.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2686238 + ... + 2686245.

It is an arithmetic number, because the mean of its divisors is an integer number (6267898).

Almost surely, 2^21489932 is an apocalyptic number.

It is an amenable number.

21489932 is a deficient number, since it is larger than the sum of its proper divisors (16117456).

21489932 is a wasteful number, since it uses less digits than its factorization.

21489932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5372487 (or 5372485 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 21489932 is about 4635.7234602595. The cubic root of 21489932 is about 278.0214775602.

The spelling of 21489932 in words is "twenty-one million, four hundred eighty-nine thousand, nine hundred thirty-two".