31220321130013 has 4 divisors (see below), whose sum is σ = 31686296072320. Its totient is φ = 30754346187708.

The previous prime is 31220321129999. The next prime is 31220321130079. The reversal of 31220321130013 is 31003112302213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31220321130013 - 2⁴¹ = 29021297874461 is a prime.

It is a super-2 number, since 2×31220321130013² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220321137013) 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, 232987471053 + ... + 232987471186.

It is an arithmetic number, because the mean of its divisors is an integer number (7921574018080).

Almost surely, 2^{31220321130013} is an apocalyptic number.

It is an amenable number.

31220321130013 is a deficient number, since it is larger than the sum of its proper divisors (465974942307).

31220321130013 is an equidigital number, since it uses as much as digits as its factorization.

31220321130013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465974942306.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31220321130013 its reverse (31003112302213), we get a palindrome (62223433432226).

The spelling of 31220321130013 in words is "thirty-one trillion, two hundred twenty billion, three hundred twenty-one million, one hundred thirty thousand, thirteen".