21917955022 has 16 divisors (see below), whose sum is σ = 32924464992. Its totient is φ = 10943147520.

The previous prime is 21917954999. The next prime is 21917955023. The reversal of 21917955022 is 22055971912.

It is a self number, because there is not a number n which added to its sum of digits gives 21917955022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21917955023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6811558 + ... + 6814774.

It is an arithmetic number, because the mean of its divisors is an integer number (2057779062).

Almost surely, 2^21917955022 is an apocalyptic number.

21917955022 is a deficient number, since it is larger than the sum of its proper divisors (11006509970).

21917955022 is a wasteful number, since it uses less digits than its factorization.

21917955022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7083.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 21917955022 in words is "twenty-one billion, nine hundred seventeen million, nine hundred fifty-five thousand, twenty-two".