21102221212 has 12 divisors (see below), whose sum is σ = 36930738040. Its totient is φ = 10550581776.

The previous prime is 21102221191. The next prime is 21102221213. The reversal of 21102221212 is 21212220112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102221213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34383 + ... + 208294.

Almost surely, 2^21102221212 is an apocalyptic number.

It is an amenable number.

21102221212 is a deficient number, since it is larger than the sum of its proper divisors (15828516828).

21102221212 is a wasteful number, since it uses less digits than its factorization.

21102221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264420 (or 264418 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21102221212 its reverse (21212220112), we get a palindrome (42314441324).

The spelling of 21102221212 in words is "twenty-one billion, one hundred two million, two hundred twenty-one thousand, two hundred twelve".