21000212312 has 16 divisors (see below), whose sum is σ = 39414054600. Its totient is φ = 10489797760.

The previous prime is 21000212309. The next prime is 21000212339. The reversal of 21000212312 is 21321200012.

It is a happy number.

It is a congruent number.

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, 1279889 + ... + 1296192.

Almost surely, 2^21000212312 is an apocalyptic number.

It is an amenable number.

21000212312 is a deficient number, since it is larger than the sum of its proper divisors (18413842288).

21000212312 is a wasteful number, since it uses less digits than its factorization.

21000212312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577106 (or 2577102 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21000212312 its reverse (21321200012), we get a palindrome (42321412324).

The spelling of 21000212312 in words is "twenty-one billion, two hundred twelve thousand, three hundred twelve".