21222968784 has 40 divisors (see below), whose sum is σ = 54899884992. Its totient is φ = 7064789760.

The previous prime is 21222968749. The next prime is 21222968813. The reversal of 21222968784 is 48786922212.

It is a congruent number.

It is an unprimeable number.

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, 261877 + ... + 333204.

Almost surely, 2^21222968784 is an apocalyptic number.

21222968784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21222968784 is an abundant number, since it is smaller than the sum of its proper divisors (33676916208).

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

21222968784 is a wasteful number, since it uses less digits than its factorization.

21222968784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595835 (or 595829 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 51.

It can be divided in two parts, 2122296 and 8784, that added together give a triangular number (2131080 = T₂₀₆₄).

The spelling of 21222968784 in words is "twenty-one billion, two hundred twenty-two million, nine hundred sixty-eight thousand, seven hundred eighty-four".