21924907 has 2 divisors, whose sum is σ = 21924908. Its totient is φ = 21924906.

The previous prime is 21924901. The next prime is 21924913. The reversal of 21924907 is 70942912.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21924901) and next prime (21924913).

It is a cyclic number.

It is not a de Polignac number, because 21924907 - 2¹⁵ = 21892139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21924901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10962453 + 10962454.

It is an arithmetic number, because the mean of its divisors is an integer number (10962454).

Almost surely, 2^21924907 is an apocalyptic number.

21924907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21924907 is an equidigital number, since it uses as much as digits as its factorization.

21924907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 21924907 is about 4682.4039765915. The cubic root of 21924907 is about 279.8847612515.

The spelling of 21924907 in words is "twenty-one million, nine hundred twenty-four thousand, nine hundred seven".