123131221104 has 160 divisors (see below), whose sum is σ = 336485963520. Its totient is φ = 38743842816.

The previous prime is 123131221099. The next prime is 123131221159. The reversal of 123131221104 is 401122131321.

It is a super-2 number, since 2×123131221104² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11201499 + ... + 11212485.

It is an arithmetic number, because the mean of its divisors is an integer number (2103037272).

Almost surely, 2^123131221104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123131221104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168242981760).

123131221104 is an abundant number, since it is smaller than the sum of its proper divisors (213354742416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123131221104 is a wasteful number, since it uses less digits than its factorization.

123131221104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11207 (or 11201 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 123131221104 its reverse (401122131321), we get a palindrome (524253352425).

The spelling of 123131221104 in words is "one hundred twenty-three billion, one hundred thirty-one million, two hundred twenty-one thousand, one hundred four".