21925607 has 4 divisors (see below), whose sum is σ = 23918856. Its totient is φ = 19932360.

The previous prime is 21925591. The next prime is 21925613. The reversal of 21925607 is 70652912.

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

It is a cyclic number.

It is not a de Polignac number, because 21925607 - 2⁴ = 21925591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21925627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996608 + ... + 996629.

It is an arithmetic number, because the mean of its divisors is an integer number (5979714).

Almost surely, 2^21925607 is an apocalyptic number.

21925607 is a deficient number, since it is larger than the sum of its proper divisors (1993249).

21925607 is a wasteful number, since it uses less digits than its factorization.

21925607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993248.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 21925607 is about 4682.4787239239. The cubic root of 21925607 is about 279.8877398616.

The spelling of 21925607 in words is "twenty-one million, nine hundred twenty-five thousand, six hundred seven".