21784556922 has 32 divisors (see below), whose sum is σ = 45143153280. Its totient is φ = 6999975360.

The previous prime is 21784556873. The next prime is 21784556953. The reversal of 21784556922 is 22965548712.

It is a super-2 number, since 2×21784556922² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10588 + ... + 209000.

It is an arithmetic number, because the mean of its divisors is an integer number (1410723540).

Almost surely, 2^21784556922 is an apocalyptic number.

21784556922 is an abundant number, since it is smaller than the sum of its proper divisors (23358596358).

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

21784556922 is a wasteful number, since it uses less digits than its factorization.

21784556922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199078.

The product of its digits is 2419200, while the sum is 51.

The spelling of 21784556922 in words is "twenty-one billion, seven hundred eighty-four million, five hundred fifty-six thousand, nine hundred twenty-two".