21312032311 has 8 divisors (see below), whose sum is σ = 21449677824. Its totient is φ = 21174658680.

The previous prime is 21312032257. The next prime is 21312032317. The reversal of 21312032311 is 11323021312.

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-21312032311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312032317) 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, 90496 + ... + 225418.

It is an arithmetic number, because the mean of its divisors is an integer number (2681209728).

Almost surely, 2^21312032311 is an apocalyptic number.

21312032311 is a deficient number, since it is larger than the sum of its proper divisors (137645513).

21312032311 is a wasteful number, since it uses less digits than its factorization.

21312032311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135941.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21312032311 its reverse (11323021312), we get a palindrome (32635053623).

The spelling of 21312032311 in words is "twenty-one billion, three hundred twelve million, thirty-two thousand, three hundred eleven".