21311203313212 has 6 divisors (see below), whose sum is σ = 37294605798128. Its totient is φ = 10655601656604.

The previous prime is 21311203313177. The next prime is 21311203313221. The reversal of 21311203313212 is 21231330211312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663900414148 + ... + 2663900414155.

Almost surely, 2^{21311203313212} is an apocalyptic number.

It is an amenable number.

21311203313212 is a deficient number, since it is larger than the sum of its proper divisors (15983402484916).

21311203313212 is a wasteful number, since it uses less digits than its factorization.

21311203313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327800828307 (or 5327800828305 counting only the distinct ones).

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

Adding to 21311203313212 its reverse (21231330211312), we get a palindrome (42542533524524).

The spelling of 21311203313212 in words is "twenty-one trillion, three hundred eleven billion, two hundred three million, three hundred thirteen thousand, two hundred twelve".