31121321103103 has 64 divisors (see below), whose sum is σ = 40018532843520. Its totient is φ = 23504210121600.

The previous prime is 31121321103049. The next prime is 31121321103137. The reversal of 31121321103103 is 30130112312113.

It is a cyclic number.

It is not a de Polignac number, because 31121321103103 - 2²⁹ = 31120784232191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121321103203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 79071268 + ... + 79463878.

It is an arithmetic number, because the mean of its divisors is an integer number (625289575680).

Almost surely, 2^{31121321103103} is an apocalyptic number.

31121321103103 is a deficient number, since it is larger than the sum of its proper divisors (8897211740417).

31121321103103 is a wasteful number, since it uses less digits than its factorization.

31121321103103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392948.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31121321103103 its reverse (30130112312113), we get a palindrome (61251433415216).

The spelling of 31121321103103 in words is "thirty-one trillion, one hundred twenty-one billion, three hundred twenty-one million, one hundred three thousand, one hundred three".