21725602 has 8 divisors (see below), whose sum is σ = 32612076. Its totient is φ = 10854912.

The previous prime is 21725581. The next prime is 21725617. The reversal of 21725602 is 20652712.

It can be written as a sum of positive squares in 2 ways, for example, as 21706281 + 19321 = 4659^2 + 139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 498 + ... + 6610.

Almost surely, 2^21725602 is an apocalyptic number.

21725602 is a deficient number, since it is larger than the sum of its proper divisors (10886474).

21725602 is a wasteful number, since it uses less digits than its factorization.

21725602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7892.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 21725602 is about 4661.0730524204. The cubic root of 21725602 is about 279.0340952581.

The spelling of 21725602 in words is "twenty-one million, seven hundred twenty-five thousand, six hundred two".