31211013123 has 32 divisors (see below), whose sum is σ = 47257067520. Its totient is φ = 20349656640.

The previous prime is 31211013089. The next prime is 31211013137. The reversal of 31211013123 is 32131011213.

It is not a de Polignac number, because 31211013123 - 2¹³ = 31211004931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31211013096 and 31211013105.

It is not an unprimeable number, because it can be changed into a prime (31211013193) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1871086 + ... + 1887692.

It is an arithmetic number, because the mean of its divisors is an integer number (1476783360).

Almost surely, 2^31211013123 is an apocalyptic number.

31211013123 is a deficient number, since it is larger than the sum of its proper divisors (16046054397).

31211013123 is a wasteful number, since it uses less digits than its factorization.

31211013123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18144 (or 18138 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31211013123 its reverse (32131011213), we get a palindrome (63342024336).

The spelling of 31211013123 in words is "thirty-one billion, two hundred eleven million, thirteen thousand, one hundred twenty-three".