21222022212 has 72 divisors (see below), whose sum is σ = 54141796800. Its totient is φ = 7008700608.

The previous prime is 21222022153. The next prime is 21222022223.

21222022212 is a `hidden beast` number, since 212 + 220 + 22 + 212 = 666.

21222022212 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2023839 + ... + 2034297.

It is an arithmetic number, because the mean of its divisors is an integer number (751969400).

Almost surely, 2^21222022212 is an apocalyptic number.

It is an amenable number.

21222022212 is an abundant number, since it is smaller than the sum of its proper divisors (32919774588).

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

21222022212 is a wasteful number, since it uses less digits than its factorization.

21222022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10985 (or 10980 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

It can be divided in two parts, 212220 and 22212, that added together give a palindrome (234432).

The spelling of 21222022212 in words is "twenty-one billion, two hundred twenty-two million, twenty-two thousand, two hundred twelve".