21311303213212 has 12 divisors (see below), whose sum is σ = 37851419140360. Its totient is φ = 10496612030256.

The previous prime is 21311303213201. The next prime is 21311303213261. The reversal of 21311303213212 is 21231230311312.

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, 39759893787 + ... + 39759894322.

Almost surely, 2^{21311303213212} is an apocalyptic number.

It is an amenable number.

21311303213212 is a deficient number, since it is larger than the sum of its proper divisors (16540115927148).

21311303213212 is a wasteful number, since it uses less digits than its factorization.

21311303213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79519788180 (or 79519788178 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21311303213212 its reverse (21231230311312), we get a palindrome (42542533524524).

The spelling of 21311303213212 in words is "twenty-one trillion, three hundred eleven billion, three hundred three million, two hundred thirteen thousand, two hundred twelve".