21102211212 has 48 divisors (see below), whose sum is σ = 51850740480. Its totient is φ = 6666504768.

The previous prime is 21102211187. The next prime is 21102211213. The reversal of 21102211212 is 21211220112.

It is a junction number, because it is equal to n+sod(n) for n = 21102211191 and 21102211200.

It is not an unprimeable number, because it can be changed into a prime (21102211213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320638 + ... + 380805.

It is an arithmetic number, because the mean of its divisors is an integer number (1080223760).

Almost surely, 2^21102211212 is an apocalyptic number.

It is an amenable number.

21102211212 is an abundant number, since it is smaller than the sum of its proper divisors (30748529268).

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

21102211212 is a wasteful number, since it uses less digits than its factorization.

21102211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701582 (or 701580 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21102211212 its reverse (21211220112), we get a palindrome (42313431324).

The spelling of 21102211212 in words is "twenty-one billion, one hundred two million, two hundred eleven thousand, two hundred twelve".