21125708 has 12 divisors (see below), whose sum is σ = 37133040. Its totient is φ = 10516272.

The previous prime is 21125693. The next prime is 21125711. The reversal of 21125708 is 80752112.

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, 10616 + ... + 12447.

It is an arithmetic number, because the mean of its divisors is an integer number (3094420).

Almost surely, 2^21125708 is an apocalyptic number.

It is an amenable number.

21125708 is a deficient number, since it is larger than the sum of its proper divisors (16007332).

21125708 is a wasteful number, since it uses less digits than its factorization.

21125708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23296 (or 23294 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 21125708 is about 4596.2710973136. The cubic root of 21125708 is about 276.4418289118.

The spelling of 21125708 in words is "twenty-one million, one hundred twenty-five thousand, seven hundred eight".