21725626 has 48 divisors (see below), whose sum is σ = 39528000. Its totient is φ = 8895744.

The previous prime is 21725617. The next prime is 21725633. The reversal of 21725626 is 62652712.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109075 + ... + 109273.

It is an arithmetic number, because the mean of its divisors is an integer number (823500).

Almost surely, 2^21725626 is an apocalyptic number.

21725626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21725626 is a deficient number, since it is larger than the sum of its proper divisors (17802374).

21725626 is a wasteful number, since it uses less digits than its factorization.

21725626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 250 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 21725626 is about 4661.0756269342. The cubic root of 21725626 is about 279.0341980066.

The spelling of 21725626 in words is "twenty-one million, seven hundred twenty-five thousand, six hundred twenty-six".