21122212211212 has 24 divisors (see below), whose sum is σ = 42249694227104. Its totient is φ = 9051247418112.

The previous prime is 21122212211201. The next prime is 21122212211213. The reversal of 21122212211212 is 21211221222112.

It is a super-2 number, since 2×21122212211212² (a number of 27 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21122212211213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46823343 + ... + 47272294.

Almost surely, 2^{21122212211212} is an apocalyptic number.

It is an amenable number.

21122212211212 is an abundant number, since it is smaller than the sum of its proper divisors (21127482015892).

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

21122212211212 is a wasteful number, since it uses less digits than its factorization.

21122212211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94103665 (or 94103663 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

Adding to 21122212211212 its reverse (21211221222112), we get a palindrome (42333433433324).

The spelling of 21122212211212 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twelve million, two hundred eleven thousand, two hundred twelve".