31013221203203 has 4 divisors (see below), whose sum is σ = 31297746168480. Its totient is φ = 30728696237928.

The previous prime is 31013221203191. The next prime is 31013221203259. The reversal of 31013221203203 is 30230212231013.

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

It is a cyclic number.

It is not a de Polignac number, because 31013221203203 - 2¹⁰ = 31013221202179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31013221203103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142262482475 + ... + 142262482692.

It is an arithmetic number, because the mean of its divisors is an integer number (7824436542120).

Almost surely, 2^{31013221203203} is an apocalyptic number.

31013221203203 is a deficient number, since it is larger than the sum of its proper divisors (284524965277).

31013221203203 is a wasteful number, since it uses less digits than its factorization.

31013221203203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284524965276.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31013221203203 its reverse (30230212231013), we get a palindrome (61243433434216).

The spelling of 31013221203203 in words is "thirty-one trillion, thirteen billion, two hundred twenty-one million, two hundred three thousand, two hundred three".