21312202212 has 72 divisors (see below), whose sum is σ = 61976433792. Its totient is φ = 6048864000.

The previous prime is 21312202199. The next prime is 21312202259. The reversal of 21312202212 is 21220221312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 241989 + ... + 318092.

Almost surely, 2^21312202212 is an apocalyptic number.

It is an amenable number.

21312202212 is an abundant number, since it is smaller than the sum of its proper divisors (40664231580).

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

21312202212 is a wasteful number, since it uses less digits than its factorization.

21312202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560249 (or 560244 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21312202212 its reverse (21220221312), we get a palindrome (42532423524).

The spelling of 21312202212 in words is "twenty-one billion, three hundred twelve million, two hundred two thousand, two hundred twelve".