21928893 has 16 divisors (see below), whose sum is σ = 33714816. Its totient is φ = 12418560.

The previous prime is 21928883. The next prime is 21928903. The reversal of 21928893 is 39882912.

It is an interprime number because it is at equal distance from previous prime (21928883) and next prime (21928903).

It is not a de Polignac number, because 21928893 - 2⁴ = 21928877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21928813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2248 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (2107176).

Almost surely, 2^21928893 is an apocalyptic number.

It is an amenable number.

21928893 is a deficient number, since it is larger than the sum of its proper divisors (11785923).

21928893 is a wasteful number, since it uses less digits than its factorization.

21928893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9364.

The product of its digits is 62208, while the sum is 42.

The square root of 21928893 is about 4682.8295933121. The cubic root of 21928893 is about 279.9017214612.

The spelling of 21928893 in words is "twenty-one million, nine hundred twenty-eight thousand, eight hundred ninety-three".