21725607 has 16 divisors (see below), whose sum is σ = 30591360. Its totient is φ = 13676832.

The previous prime is 21725581. The next prime is 21725617. The reversal of 21725607 is 70652712.

It is not a de Polignac number, because 21725607 - 2⁷ = 21725479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21725617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31753 + ... + 32429.

It is an arithmetic number, because the mean of its divisors is an integer number (1911960).

Almost surely, 2^21725607 is an apocalyptic number.

21725607 is a deficient number, since it is larger than the sum of its proper divisors (8865753).

21725607 is a wasteful number, since it uses less digits than its factorization.

21725607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 21725607 is about 4661.0735887776. The cubic root of 21725607 is about 279.0341166640.

The spelling of 21725607 in words is "twenty-one million, seven hundred twenty-five thousand, six hundred seven".