21924927 has 12 divisors (see below), whose sum is σ = 31795920. Its totient is φ = 14558208.

The previous prime is 21924923. The next prime is 21924937. The reversal of 21924927 is 72942912.

It is not a de Polignac number, because 21924927 - 2² = 21924923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21924891 and 21924900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2427 + ... + 7052.

It is an arithmetic number, because the mean of its divisors is an integer number (2649660).

Almost surely, 2^21924927 is an apocalyptic number.

21924927 is a deficient number, since it is larger than the sum of its proper divisors (9870993).

21924927 is a wasteful number, since it uses less digits than its factorization.

21924927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9742 (or 9739 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 21924927 is about 4682.4061122461. The cubic root of 21924927 is about 279.8848463555.

The spelling of 21924927 in words is "twenty-one million, nine hundred twenty-four thousand, nine hundred twenty-seven".