3121311101123 has 4 divisors (see below), whose sum is σ = 3122589805368. Its totient is φ = 3120032396880.

The previous prime is 3121311101099. The next prime is 3121311101177. The reversal of 3121311101123 is 3211011131213.

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 3121311101123 - 2⁸ = 3121311100867 is a prime.

It is a super-2 number, since 2×3121311101123² (a number of 26 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 = 3121311101095 and 3121311101104.

It is not an unprimeable number, because it can be changed into a prime (3121311401123) 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, 639348461 + ... + 639353342.

It is an arithmetic number, because the mean of its divisors is an integer number (780647451342).

Almost surely, 2^{3121311101123} is an apocalyptic number.

3121311101123 is a deficient number, since it is larger than the sum of its proper divisors (1278704245).

3121311101123 is a wasteful number, since it uses less digits than its factorization.

3121311101123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278704244.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 3121311101123 its reverse (3211011131213), we get a palindrome (6332322232336).

The spelling of 3121311101123 in words is "three trillion, one hundred twenty-one billion, three hundred eleven million, one hundred one thousand, one hundred twenty-three".