31103212133123 has 4 divisors (see below), whose sum is σ = 33495766912608. Its totient is φ = 28710657353640.

The previous prime is 31103212133117. The next prime is 31103212133137. The reversal of 31103212133123 is 32133121230113.

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 31103212133123 - 2⁴ = 31103212133107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31103212133092 and 31103212133101.

It is not an unprimeable number, because it can be changed into a prime (31103212133173) 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, 1196277389723 + ... + 1196277389748.

It is an arithmetic number, because the mean of its divisors is an integer number (8373941728152).

Almost surely, 2^{31103212133123} is an apocalyptic number.

31103212133123 is a deficient number, since it is larger than the sum of its proper divisors (2392554779485).

31103212133123 is a wasteful number, since it uses less digits than its factorization.

31103212133123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392554779484.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31103212133123 its reverse (32133121230113), we get a palindrome (63236333363236).

The spelling of 31103212133123 in words is "thirty-one trillion, one hundred three billion, two hundred twelve million, one hundred thirty-three thousand, one hundred twenty-three".