21925929 has 4 divisors (see below), whose sum is σ = 29234576. Its totient is φ = 14617284.

The previous prime is 21925927. The next prime is 21925961. The reversal of 21925929 is 92952912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21925929 - 2¹ = 21925927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21925927) 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, 3654319 + ... + 3654324.

It is an arithmetic number, because the mean of its divisors is an integer number (7308644).

Almost surely, 2^21925929 is an apocalyptic number.

It is an amenable number.

21925929 is a deficient number, since it is larger than the sum of its proper divisors (7308647).

21925929 is an equidigital number, since it uses as much as digits as its factorization.

21925929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7308646.

The product of its digits is 29160, while the sum is 39.

The square root of 21925929 is about 4682.5131072961. The cubic root of 21925929 is about 279.8891100010.

The spelling of 21925929 in words is "twenty-one million, nine hundred twenty-five thousand, nine hundred twenty-nine".