21922865 has 8 divisors (see below), whose sum is σ = 27692160. Its totient is φ = 16615152.

The previous prime is 21922853. The next prime is 21922889. The reversal of 21922865 is 56822912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21922865 - 2¹⁴ = 21906481 is a prime.

It is a super-2 number, since 2×21922865² = 961224019616450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115289 + ... + 115478.

It is an arithmetic number, because the mean of its divisors is an integer number (3461520).

Almost surely, 2^21922865 is an apocalyptic number.

It is an amenable number.

21922865 is a deficient number, since it is larger than the sum of its proper divisors (5769295).

21922865 is a wasteful number, since it uses less digits than its factorization.

21922865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230791.

The product of its digits is 17280, while the sum is 35.

The square root of 21922865 is about 4682.1859211270. The cubic root of 21922865 is about 279.8760718581.

The spelling of 21922865 in words is "twenty-one million, nine hundred twenty-two thousand, eight hundred sixty-five".