20121311321 has 8 divisors (see below), whose sum is σ = 20445312384. Its totient is φ = 19798438240.

The previous prime is 20121311317. The next prime is 20121311323. The reversal of 20121311321 is 12311312102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121311321 - 2² = 20121311317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121311321.

It is not an unprimeable number, because it can be changed into a prime (20121311323) 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, 245996 + ... + 317421.

It is an arithmetic number, because the mean of its divisors is an integer number (2555664048).

Almost surely, 2^20121311321 is an apocalyptic number.

It is an amenable number.

20121311321 is a deficient number, since it is larger than the sum of its proper divisors (324001063).

20121311321 is an equidigital number, since it uses as much as digits as its factorization.

20121311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563991.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20121311321 its reverse (12311312102), we get a palindrome (32432623423).

The spelling of 20121311321 in words is "twenty billion, one hundred twenty-one million, three hundred eleven thousand, three hundred twenty-one".