21902221722170 has 16 divisors (see below), whose sum is σ = 39573900241920. Its totient is φ = 8727577323984.

The previous prime is 21902221722149. The next prime is 21902221722193. The reversal of 21902221722170 is 7122712220912.

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, 4163917850 + ... + 4163923109.

It is an arithmetic number, because the mean of its divisors is an integer number (2473368765120).

Almost surely, 2^{21902221722170} is an apocalyptic number.

21902221722170 is a deficient number, since it is larger than the sum of its proper divisors (17671678519750).

21902221722170 is a wasteful number, since it uses less digits than its factorization.

21902221722170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8327841229.

The product of its (nonzero) digits is 28224, while the sum is 38.

The spelling of 21902221722170 in words is "twenty-one trillion, nine hundred two billion, two hundred twenty-one million, seven hundred twenty-two thousand, one hundred seventy".