21925995 has 32 divisors (see below), whose sum is σ = 43180032. Its totient is φ = 9251712.

The previous prime is 21925987. The next prime is 21925997. The reversal of 21925995 is 59952912.

It is a happy number.

It is not a de Polignac number, because 21925995 - 2³ = 21925987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21925997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6667 + ... + 9396.

It is an arithmetic number, because the mean of its divisors is an integer number (1349376).

Almost surely, 2^21925995 is an apocalyptic number.

21925995 is a deficient number, since it is larger than the sum of its proper divisors (21254037).

21925995 is a wasteful number, since it uses less digits than its factorization.

21925995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16091.

The product of its digits is 72900, while the sum is 42.

The square root of 21925995 is about 4682.5201547884. The cubic root of 21925995 is about 279.8893908353.

The spelling of 21925995 in words is "twenty-one million, nine hundred twenty-five thousand, nine hundred ninety-five".