21489004 has 12 divisors (see below), whose sum is σ = 37638328. Its totient is φ = 10735200.

The previous prime is 21489001. The next prime is 21489007. The reversal of 21489004 is 40098412.

It is an interprime number because it is at equal distance from previous prime (21489001) and next prime (21489007).

It is not an unprimeable number, because it can be changed into a prime (21489001) 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, 7264 + ... + 9784.

Almost surely, 2^21489004 is an apocalyptic number.

It is an amenable number.

21489004 is a deficient number, since it is larger than the sum of its proper divisors (16149324).

21489004 is a wasteful number, since it uses less digits than its factorization.

21489004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656 (or 4654 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21489004 is about 4635.6233669270. The cubic root of 21489004 is about 278.0174755676.

The spelling of 21489004 in words is "twenty-one million, four hundred eighty-nine thousand, four".