31331320130321 has 4 divisors (see below), whose sum is σ = 31331331440052. Its totient is φ = 31331308820592.

The previous prime is 31331320130293. The next prime is 31331320130393. The reversal of 31331320130321 is 12303102313313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 28358937246721 + 2972382883600 = 5325311^2 + 1724060^2 .

It is a cyclic number.

It is not a de Polignac number, because 31331320130321 - 2¹⁰ = 31331320129297 is a prime.

It is a super-2 number, since 2×31331320130321² (a number of 28 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 (31331328130321) 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, 1621655 + ... + 8080371.

It is an arithmetic number, because the mean of its divisors is an integer number (7832832860013).

Almost surely, 2^{31331320130321} is an apocalyptic number.

It is an amenable number.

31331320130321 is a deficient number, since it is larger than the sum of its proper divisors (11309731).

31331320130321 is an equidigital number, since it uses as much as digits as its factorization.

31331320130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11309730.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 31331320130321 its reverse (12303102313313), we get a palindrome (43634422443634).

The spelling of 31331320130321 in words is "thirty-one trillion, three hundred thirty-one billion, three hundred twenty million, one hundred thirty thousand, three hundred twenty-one".