31103220203031 has 4 divisors (see below), whose sum is σ = 41470960270712. Its totient is φ = 20735480135352.

The previous prime is 31103220202993. The next prime is 31103220203117. The reversal of 31103220203031 is 13030202230113.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31103220203031 - 2¹⁰ = 31103220202007 is a prime.

It is a super-2 number, since 2×31103220203031² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31103220202989 and 31103220203007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103220203431) 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, 5183870033836 + ... + 5183870033841.

It is an arithmetic number, because the mean of its divisors is an integer number (10367740067678).

Almost surely, 2^{31103220203031} is an apocalyptic number.

31103220203031 is a deficient number, since it is larger than the sum of its proper divisors (10367740067681).

31103220203031 is a wasteful number, since it uses less digits than its factorization.

31103220203031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10367740067680.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31103220203031 its reverse (13030202230113), we get a palindrome (44133422433144).

The spelling of 31103220203031 in words is "thirty-one trillion, one hundred three billion, two hundred twenty million, two hundred three thousand, thirty-one".