31321220313203 has 2 divisors, whose sum is σ = 31321220313204. Its totient is φ = 31321220313202.

The previous prime is 31321220313191. The next prime is 31321220313211. The reversal of 31321220313203 is 30231302212313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321220313203 is a prime.

It is a super-2 number, since 2×31321220313203² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31321220313223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660610156601 + 15660610156602.

It is an arithmetic number, because the mean of its divisors is an integer number (15660610156602).

Almost surely, 2^{31321220313203} is an apocalyptic number.

31321220313203 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321220313203 is an equidigital number, since it uses as much as digits as its factorization.

31321220313203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 31321220313203 its reverse (30231302212313), we get a palindrome (61552522525516).

The spelling of 31321220313203 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred twenty million, three hundred thirteen thousand, two hundred three".