21499332 has 24 divisors (see below), whose sum is σ = 50450400. Its totient is φ = 7125696.

The previous prime is 21499321. The next prime is 21499343. The reversal of 21499332 is 23399412.

It is an interprime number because it is at equal distance from previous prime (21499321) and next prime (21499343).

It is a junction number, because it is equal to n+sod(n) for n = 21499293 and 21499302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2857 + ... + 7152.

It is an arithmetic number, because the mean of its divisors is an integer number (2102100).

Almost surely, 2^21499332 is an apocalyptic number.

It is an amenable number.

21499332 is an abundant number, since it is smaller than the sum of its proper divisors (28951068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21499332 is a wasteful number, since it uses less digits than its factorization.

21499332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10195 (or 10193 counting only the distinct ones).

The product of its digits is 11664, while the sum is 33.

The square root of 21499332 is about 4636.7372148958. The cubic root of 21499332 is about 278.0620084924.

The spelling of 21499332 in words is "twenty-one million, four hundred ninety-nine thousand, three hundred thirty-two".