23121131310 has 96 divisors (see below), whose sum is σ = 62331366240. Its totient is φ = 5939291904.

The previous prime is 23121131251. The next prime is 23121131321. The reversal of 23121131310 is 1313112132.

23121131310 is a `hidden beast` number, since 2 + 312 + 11 + 31 + 310 = 666.

It is a super-2 number, since 2×23121131310² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1146232 + ... + 1166228.

It is an arithmetic number, because the mean of its divisors is an integer number (649285065).

Almost surely, 2^23121131310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23121131310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31165683120).

23121131310 is an abundant number, since it is smaller than the sum of its proper divisors (39210234930).

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

23121131310 is a wasteful number, since it uses less digits than its factorization.

23121131310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20482 (or 20479 counting only the distinct ones).

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

Adding to 23121131310 its reverse (1313112132), we get a palindrome (24434243442).

The spelling of 23121131310 in words is "twenty-three billion, one hundred twenty-one million, one hundred thirty-one thousand, three hundred ten".