21222312876 has 24 divisors (see below), whose sum is σ = 55020811440. Its totient is φ = 7074104256.

The previous prime is 21222312871. The next prime is 21222312893. The reversal of 21222312876 is 67821322212.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21222312876.

It is not an unprimeable number, because it can be changed into a prime (21222312871) 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, 98251341 + ... + 98251556.

It is an arithmetic number, because the mean of its divisors is an integer number (2292533810).

Almost surely, 2^21222312876 is an apocalyptic number.

It is an amenable number.

21222312876 is an abundant number, since it is smaller than the sum of its proper divisors (33798498564).

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

21222312876 is a wasteful number, since it uses less digits than its factorization.

21222312876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196502910 (or 196502902 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The spelling of 21222312876 in words is "twenty-one billion, two hundred twenty-two million, three hundred twelve thousand, eight hundred seventy-six".