21925208865 has 32 divisors (see below), whose sum is σ = 41474292480. Its totient is φ = 9677332224.

The previous prime is 21925208849. The next prime is 21925208887. The reversal of 21925208865 is 56880252912.

It is not a de Polignac number, because 21925208865 - 2⁴ = 21925208849 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3597154 + ... + 3603243.

It is an arithmetic number, because the mean of its divisors is an integer number (1296071640).

Almost surely, 2^21925208865 is an apocalyptic number.

It is an amenable number.

21925208865 is a deficient number, since it is larger than the sum of its proper divisors (19549083615).

21925208865 is a wasteful number, since it uses less digits than its factorization.

21925208865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7200441.

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 21925208865 in words is "twenty-one billion, nine hundred twenty-five million, two hundred eight thousand, eight hundred sixty-five".