21109922 has 8 divisors (see below), whose sum is σ = 31686636. Its totient is φ = 10547712.

The previous prime is 21109901. The next prime is 21109927. The reversal of 21109922 is 22990112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16491721 + 4618201 = 4061^2 + 2149^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21109891 and 21109900.

It is not an unprimeable number, because it can be changed into a prime (21109927) 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, 1418 + ... + 6650.

Almost surely, 2^21109922 is an apocalyptic number.

21109922 is a deficient number, since it is larger than the sum of its proper divisors (10576714).

21109922 is a wasteful number, since it uses less digits than its factorization.

21109922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7252.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21109922 is about 4594.5535147607. The cubic root of 21109922 is about 276.3729555100.

The spelling of 21109922 in words is "twenty-one million, one hundred nine thousand, nine hundred twenty-two".