21922688 has 16 divisors (see below), whose sum is σ = 43674360. Its totient is φ = 10961280.

The previous prime is 21922687. The next prime is 21922697. The reversal of 21922688 is 88622912.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85508 + ... + 85763.

Almost surely, 2^21922688 is an apocalyptic number.

It is an amenable number.

21922688 is a deficient number, since it is larger than the sum of its proper divisors (21751672).

21922688 is an equidigital number, since it uses as much as digits as its factorization.

21922688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171285 (or 171273 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 21922688 is about 4682.1670196609. The cubic root of 21922688 is about 279.8753186385.

The spelling of 21922688 in words is "twenty-one million, nine hundred twenty-two thousand, six hundred eighty-eight".