21718521222 has 16 divisors (see below), whose sum is σ = 43438524480. Its totient is φ = 7239260072.

The previous prime is 21718521161. The next prime is 21718521263. The reversal of 21718521222 is 22212581712.

It is a congruent number.

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, 249229 + ... + 324887.

It is an arithmetic number, because the mean of its divisors is an integer number (2714907780).

Almost surely, 2^21718521222 is an apocalyptic number.

21718521222 is an abundant number, since it is smaller than the sum of its proper divisors (21720003258).

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

21718521222 is a wasteful number, since it uses less digits than its factorization.

21718521222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123507.

The product of its digits is 8960, while the sum is 33.

The spelling of 21718521222 in words is "twenty-one billion, seven hundred eighteen million, five hundred twenty-one thousand, two hundred twenty-two".