21924897 has 8 divisors (see below), whose sum is σ = 29334144. Its totient is φ = 14566128.

The previous prime is 21924869. The next prime is 21924901. The reversal of 21924897 is 79842912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21924897 - 2⁷ = 21924769 is a prime.

It is a super-2 number, since 2×21924897² = 961402216921218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21924817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11593 + ... + 13350.

It is an arithmetic number, because the mean of its divisors is an integer number (3666768).

Almost surely, 2^21924897 is an apocalyptic number.

It is an amenable number.

21924897 is a deficient number, since it is larger than the sum of its proper divisors (7409247).

21924897 is a wasteful number, since it uses less digits than its factorization.

21924897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25239.

The product of its digits is 72576, while the sum is 42.

The square root of 21924897 is about 4682.4029087638. The cubic root of 21924897 is about 279.8847186995.

The spelling of 21924897 in words is "twenty-one million, nine hundred twenty-four thousand, eight hundred ninety-seven".