21312031321211 has 8 divisors (see below), whose sum is σ = 21877781063424. Its totient is φ = 20749468902120.

The previous prime is 21312031321177. The next prime is 21312031321237. The reversal of 21312031321211 is 11212313021312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21312031321211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312031321271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796817231 + ... + 796843976.

It is an arithmetic number, because the mean of its divisors is an integer number (2734722632928).

Almost surely, 2^{21312031321211} is an apocalyptic number.

21312031321211 is a deficient number, since it is larger than the sum of its proper divisors (565749742213).

21312031321211 is a wasteful number, since it uses less digits than its factorization.

21312031321211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593661561.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21312031321211 its reverse (11212313021312), we get a palindrome (32524344342523).

The spelling of 21312031321211 in words is "twenty-one trillion, three hundred twelve billion, thirty-one million, three hundred twenty-one thousand, two hundred eleven".