21925606 has 4 divisors (see below), whose sum is σ = 32888412. Its totient is φ = 10962802.

The previous prime is 21925591. The next prime is 21925613. The reversal of 21925606 is 60652912.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5481400 + ... + 5481403.

It is an arithmetic number, because the mean of its divisors is an integer number (8222103).

Almost surely, 2^21925606 is an apocalyptic number.

21925606 is a deficient number, since it is larger than the sum of its proper divisors (10962806).

21925606 is a wasteful number, since it uses less digits than its factorization.

21925606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962805.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 21925606 is about 4682.4786171428. The cubic root of 21925606 is about 279.8877356065.

The spelling of 21925606 in words is "twenty-one million, nine hundred twenty-five thousand, six hundred six".