21926297 has 4 divisors (see below), whose sum is σ = 22037796. Its totient is φ = 21814800.

The previous prime is 21926293. The next prime is 21926321. The reversal of 21926297 is 79262912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20894041 + 1032256 = 4571^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 21926297 - 2² = 21926293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21926297.

It is not an unprimeable number, because it can be changed into a prime (21926293) 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, 55454 + ... + 55847.

It is an arithmetic number, because the mean of its divisors is an integer number (5509449).

Almost surely, 2^21926297 is an apocalyptic number.

It is an amenable number.

21926297 is a deficient number, since it is larger than the sum of its proper divisors (111499).

21926297 is a wasteful number, since it uses less digits than its factorization.

21926297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111498.

The product of its digits is 27216, while the sum is 38.

The square root of 21926297 is about 4682.5524022695. The cubic root of 21926297 is about 279.8906758581.

The spelling of 21926297 in words is "twenty-one million, nine hundred twenty-six thousand, two hundred ninety-seven".