21213302312 has 16 divisors (see below), whose sum is σ = 39793448340. Its totient is φ = 10601716096.

The previous prime is 21213302309. The next prime is 21213302329. The reversal of 21213302312 is 21320331212.

It can be written as a sum of positive squares in 2 ways, for example, as 18759685156 + 2453617156 = 136966^2 + 49534^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 598583 + ... + 633030.

Almost surely, 2^21213302312 is an apocalyptic number.

It is an amenable number.

21213302312 is a deficient number, since it is larger than the sum of its proper divisors (18580146028).

21213302312 is a wasteful number, since it uses less digits than its factorization.

21213302312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233772 (or 1233768 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21213302312 its reverse (21320331212), we get a palindrome (42533633524).

The spelling of 21213302312 in words is "twenty-one billion, two hundred thirteen million, three hundred two thousand, three hundred twelve".