22221121212 has 36 divisors (see below), whose sum is σ = 56175721056. Its totient is φ = 7406293440.

The previous prime is 22221121171. The next prime is 22221121249. The reversal of 22221121212 is 21212112222.

It is a happy number.

22221121212 is a `hidden beast` number, since 222 + 211 + 21 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 420637 + ... + 470507.

It is an arithmetic number, because the mean of its divisors is an integer number (1560436696).

Almost surely, 2^22221121212 is an apocalyptic number.

It is an amenable number.

22221121212 is an abundant number, since it is smaller than the sum of its proper divisors (33954599844).

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

22221121212 is a wasteful number, since it uses less digits than its factorization.

22221121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62258 (or 62253 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 22221121212 its reverse (21212112222), we get a palindrome (43433233434).

The spelling of 22221121212 in words is "twenty-two billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".