21910922 has 16 divisors (see below), whose sum is σ = 36154944. Its totient is φ = 9958300.

The previous prime is 21910891. The next prime is 21910937. The reversal of 21910922 is 22901912.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21910891 and 21910900.

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, 1454 + ... + 6777.

It is an arithmetic number, because the mean of its divisors is an integer number (2259684).

Almost surely, 2^21910922 is an apocalyptic number.

21910922 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21910922 is a deficient number, since it is larger than the sum of its proper divisors (14244022).

21910922 is an equidigital number, since it uses as much as digits as its factorization.

21910922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8266 (or 8244 counting only the distinct ones).

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

The square root of 21910922 is about 4680.9103815390. The cubic root of 21910922 is about 279.8252395864.

The spelling of 21910922 in words is "twenty-one million, nine hundred ten thousand, nine hundred twenty-two".