22221212022 has 24 divisors (see below), whose sum is σ = 48572034264. Its totient is φ = 7341520704.

The previous prime is 22221212017. The next prime is 22221212033. The reversal of 22221212022 is 22021212222.

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

It is a junction number, because it is equal to n+sod(n) for n = 22221211986 and 22221212004.

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 11 ways as a sum of consecutive naturals, for example, 5460408 + ... + 5464475.

It is an arithmetic number, because the mean of its divisors is an integer number (2023834761).

Almost surely, 2^22221212022 is an apocalyptic number.

22221212022 is an abundant number, since it is smaller than the sum of its proper divisors (26350822242).

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

22221212022 is a wasteful number, since it uses less digits than its factorization.

22221212022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10925004 (or 10925001 counting only the distinct ones).

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

Adding to 22221212022 its reverse (22021212222), we get a palindrome (44242424244).

The spelling of 22221212022 in words is "twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, twenty-two".