21125208 has 32 divisors (see below), whose sum is σ = 56876400. Its totient is φ = 6499968.

The previous prime is 21125183. The next prime is 21125219. The reversal of 21125208 is 80252112.

It is a happy number.

It is a congruent number.

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, 33543 + ... + 34166.

Almost surely, 2^21125208 is an apocalyptic number.

It is an amenable number.

21125208 is an abundant number, since it is smaller than the sum of its proper divisors (35751192).

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

21125208 is a wasteful number, since it uses less digits than its factorization.

21125208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67731 (or 67727 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21125208 is about 4596.2167050739. The cubic root of 21125208 is about 276.4396479671.

The spelling of 21125208 in words is "twenty-one million, one hundred twenty-five thousand, two hundred eight".