21122212212112 has 20 divisors (see below), whose sum is σ = 44644675812336. Its totient is φ = 9601005550880.

The previous prime is 21122212212067. The next prime is 21122212212149. The reversal of 21122212212112 is 21121221222112.

It is a super-2 number, since 2×21122212212112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 3 ways as a sum of consecutive naturals, for example, 60006284518 + ... + 60006284869.

Almost surely, 2^{21122212212112} is an apocalyptic number.

21122212212112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21122212212112 is an abundant number, since it is smaller than the sum of its proper divisors (23522463600224).

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

21122212212112 is a wasteful number, since it uses less digits than its factorization.

21122212212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120012569406 (or 120012569400 counting only the distinct ones).

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

Adding to 21122212212112 its reverse (21121221222112), we get a palindrome (42243433434224).

The spelling of 21122212212112 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twelve million, two hundred twelve thousand, one hundred twelve".