31103304221213 has 6 divisors (see below), whose sum is σ = 36181394706366. Its totient is φ = 26659975046712.

The previous prime is 31103304221173. The next prime is 31103304221257. The reversal of 31103304221213 is 31212240330113.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 31008660005764 + 94644215449 = 5568542^2 + 307643^2 .

It is not a de Polignac number, because 31103304221213 - 2²⁰ = 31103303172637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103304221263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 317380655270 + ... + 317380655367.

It is an arithmetic number, because the mean of its divisors is an integer number (6030232451061).

Almost surely, 2^{31103304221213} is an apocalyptic number.

It is an amenable number.

31103304221213 is a deficient number, since it is larger than the sum of its proper divisors (5078090485153).

31103304221213 is an equidigital number, since it uses as much as digits as its factorization.

31103304221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634761310651 (or 634761310644 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31103304221213 its reverse (31212240330113), we get a palindrome (62315544551326).

The spelling of 31103304221213 in words is "thirty-one trillion, one hundred three billion, three hundred four million, two hundred twenty-one thousand, two hundred thirteen".