21102222211212 has 12 divisors (see below), whose sum is σ = 49238518492856. Its totient is φ = 7034074070400.

The previous prime is 21102222211193. The next prime is 21102222211237. The reversal of 21102222211212 is 21211222220112.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879259258789 + ... + 879259258812.

Almost surely, 2^{21102222211212} is an apocalyptic number.

It is an amenable number.

21102222211212 is an abundant number, since it is smaller than the sum of its proper divisors (28136296281644).

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

21102222211212 is a wasteful number, since it uses less digits than its factorization.

21102222211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758518517608 (or 1758518517606 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21102222211212 its reverse (21211222220112), we get a palindrome (42313444431324).

The spelling of 21102222211212 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twelve".