21102212211212 has 48 divisors (see below), whose sum is σ = 42044488625664. Its totient is φ = 9173373264000.

The previous prime is 21102212211187. The next prime is 21102212211253. The reversal of 21102212211212 is 21211221220112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4491137 + ... + 7897767.

It is an arithmetic number, because the mean of its divisors is an integer number (875926846368).

Almost surely, 2^{21102212211212} is an apocalyptic number.

21102212211212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21102212211212 is a deficient number, since it is larger than the sum of its proper divisors (20942276414452).

21102212211212 is a wasteful number, since it uses less digits than its factorization.

21102212211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3412790 (or 3412788 counting only the distinct ones).

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

Adding to 21102212211212 its reverse (21211221220112), we get a palindrome (42313433431324).

The spelling of 21102212211212 in words is "twenty-one trillion, one hundred two billion, two hundred twelve million, two hundred eleven thousand, two hundred twelve".