21915989922 has 8 divisors (see below), whose sum is σ = 43831979856. Its totient is φ = 7305329972.

The previous prime is 21915989891. The next prime is 21915989929. The reversal of 21915989922 is 22998951912.

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

21915989922 is an admirable number.

It is a super-2 number, since 2×21915989922² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21915989929) 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, 1826332488 + ... + 1826332499.

It is an arithmetic number, because the mean of its divisors is an integer number (5478997482).

Almost surely, 2^21915989922 is an apocalyptic number.

21915989922 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21915989922 is a wasteful number, since it uses less digits than its factorization.

21915989922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3652664992.

The product of its digits is 2099520, while the sum is 57.

The spelling of 21915989922 in words is "twenty-one billion, nine hundred fifteen million, nine hundred eighty-nine thousand, nine hundred twenty-two".