21925417709 has 16 divisors (see below), whose sum is σ = 25032430080. Its totient is φ = 19056617280.

The previous prime is 21925417681. The next prime is 21925417721. The reversal of 21925417709 is 90771452912.

It is a cyclic number.

It is not a de Polignac number, because 21925417709 - 2²⁸ = 21656982253 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 (21925417799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720299 + ... + 750120.

It is an arithmetic number, because the mean of its divisors is an integer number (1564526880).

Almost surely, 2^21925417709 is an apocalyptic number.

It is an amenable number.

21925417709 is a deficient number, since it is larger than the sum of its proper divisors (3107012371).

21925417709 is a wasteful number, since it uses less digits than its factorization.

21925417709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470500.

The product of its (nonzero) digits is 317520, while the sum is 47.

The spelling of 21925417709 in words is "twenty-one billion, nine hundred twenty-five million, four hundred seventeen thousand, seven hundred nine".