21122120112212 has 24 divisors (see below), whose sum is σ = 42247854895680. Its totient is φ = 9051562618560.

The previous prime is 21122120112127. The next prime is 21122120112229. The reversal of 21122120112212 is 21221102122112.

It is a super-2 number, since 2×21122120112212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31940714 + ... + 32595297.

It is an arithmetic number, because the mean of its divisors is an integer number (1760327287320).

Almost surely, 2^{21122120112212} is an apocalyptic number.

It is an amenable number.

21122120112212 is an abundant number, since it is smaller than the sum of its proper divisors (21125734783468).

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

21122120112212 is a wasteful number, since it uses less digits than its factorization.

21122120112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64547711 (or 64547709 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21122120112212 its reverse (21221102122112), we get a palindrome (42343222234324).

The spelling of 21122120112212 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty million, one hundred twelve thousand, two hundred twelve".