21498508 has 12 divisors (see below), whose sum is σ = 37657872. Its totient is φ = 10739120.

The previous prime is 21498461. The next prime is 21498511. The reversal of 21498508 is 80589412.

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, 4266 + ... + 7822.

It is an arithmetic number, because the mean of its divisors is an integer number (3138156).

Almost surely, 2^21498508 is an apocalyptic number.

It is an amenable number.

21498508 is a deficient number, since it is larger than the sum of its proper divisors (16159364).

21498508 is a wasteful number, since it uses less digits than its factorization.

21498508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072 (or 5070 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 21498508 is about 4636.6483584589. The cubic root of 21498508 is about 278.0584560406.

The spelling of 21498508 in words is "twenty-one million, four hundred ninety-eight thousand, five hundred eight".