21100212222212 has 24 divisors (see below), whose sum is σ = 37882176731616. Its totient is φ = 10280215614528.

The previous prime is 21100212222181. The next prime is 21100212222289. The reversal of 21100212222212 is 21222221200112.

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, 435282998 + ... + 435331469.

It is an arithmetic number, because the mean of its divisors is an integer number (1578424030484).

Almost surely, 2^{21100212222212} is an apocalyptic number.

It is an amenable number.

21100212222212 is a deficient number, since it is larger than the sum of its proper divisors (16781964509404).

21100212222212 is a wasteful number, since it uses less digits than its factorization.

21100212222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870614627 (or 870614625 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21100212222212 its reverse (21222221200112), we get a palindrome (42322433422324).

The spelling of 21100212222212 in words is "twenty-one trillion, one hundred billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twelve".