21102101211212 has 24 divisors (see below), whose sum is σ = 42204650767104. Its totient is φ = 9043661588112.

The previous prime is 21102101211209. The next prime is 21102101211221. The reversal of 21102101211212 is 21211210120112.

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, 1287968 + ... + 6622919.

It is an arithmetic number, because the mean of its divisors is an integer number (1758527115296).

Almost surely, 2^{21102101211212} is an apocalyptic number.

It is an amenable number.

21102101211212 is an abundant number, since it is smaller than the sum of its proper divisors (21102549555892).

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

21102101211212 is a wasteful number, since it uses less digits than its factorization.

21102101211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8006165 (or 8006163 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21102101211212 its reverse (21211210120112), we get a palindrome (42313311331324).

The spelling of 21102101211212 in words is "twenty-one trillion, one hundred two billion, one hundred one million, two hundred eleven thousand, two hundred twelve".