22121122212 has 72 divisors (see below), whose sum is σ = 64538265792. Its totient is φ = 6257736000.

The previous prime is 22121122187. The next prime is 22121122271. The reversal of 22121122212 is 21222112122.

It is a happy number.

22121122212 is a `hidden beast` number, since 221 + 211 + 22 + 212 = 666.

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 an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 409114 + ... + 460017.

Almost surely, 2^22121122212 is an apocalyptic number.

It is an amenable number.

22121122212 is an abundant number, since it is smaller than the sum of its proper divisors (42417143580).

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

22121122212 is a wasteful number, since it uses less digits than its factorization.

22121122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869249 (or 869244 counting only the distinct ones).

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

Adding to 22121122212 its reverse (21222112122), we get a palindrome (43343234334).

The spelling of 22121122212 in words is "twenty-two billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twelve".