20312131001321 has 4 divisors (see below), whose sum is σ = 20312233455444. Its totient is φ = 20312028547200.

The previous prime is 20312131001311. The next prime is 20312131001329. The reversal of 20312131001321 is 12310013121302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7990374225625 + 12321756775696 = 2826725^2 + 3510236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312131001321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20312131001293 and 20312131001302.

It is not an unprimeable number, because it can be changed into a prime (20312131001329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50929100 + ... + 51326381.

It is an arithmetic number, because the mean of its divisors is an integer number (5078058363861).

Almost surely, 2^{20312131001321} is an apocalyptic number.

It is an amenable number.

20312131001321 is a deficient number, since it is larger than the sum of its proper divisors (102454123).

20312131001321 is a wasteful number, since it uses less digits than its factorization.

20312131001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102454122.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20312131001321 its reverse (12310013121302), we get a palindrome (32622144122623).

The spelling of 20312131001321 in words is "twenty trillion, three hundred twelve billion, one hundred thirty-one million, one thousand, three hundred twenty-one".