21489032 has 16 divisors (see below), whose sum is σ = 40778640. Its totient is φ = 10614736.

The previous prime is 21489031. The next prime is 21489047. The reversal of 21489032 is 23098412.

It is a junction number, because it is equal to n+sod(n) for n = 21488986 and 21489004.

It is not an unprimeable number, because it can be changed into a prime (21489031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15518 + ... + 16845.

It is an arithmetic number, because the mean of its divisors is an integer number (2548665).

Almost surely, 2^21489032 is an apocalyptic number.

It is an amenable number.

21489032 is a deficient number, since it is larger than the sum of its proper divisors (19289608).

21489032 is a wasteful number, since it uses less digits than its factorization.

21489032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32452 (or 32448 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21489032 is about 4635.6263870161. The cubic root of 21489032 is about 278.0175963190.

The spelling of 21489032 in words is "twenty-one million, four hundred eighty-nine thousand, thirty-two".