1031320421321 has 4 divisors (see below), whose sum is σ = 1066883194500. Its totient is φ = 995757648144.

The previous prime is 1031320421293. The next prime is 1031320421389. The reversal of 1031320421321 is 1231240231301.

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 178349959225 + 852970462096 = 422315^2 + 923564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031320421321 is a prime.

It is a super-2 number, since 2×1031320421321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1031320426321) 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, 17781386546 + ... + 17781386603.

It is an arithmetic number, because the mean of its divisors is an integer number (266720798625).

Almost surely, 2^{1031320421321} is an apocalyptic number.

It is an amenable number.

1031320421321 is a deficient number, since it is larger than the sum of its proper divisors (35562773179).

1031320421321 is an equidigital number, since it uses as much as digits as its factorization.

1031320421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35562773178.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1031320421321 its reverse (1231240231301), we get a palindrome (2262560652622).

The spelling of 1031320421321 in words is "one trillion, thirty-one billion, three hundred twenty million, four hundred twenty-one thousand, three hundred twenty-one".