23121331311 has 16 divisors (see below), whose sum is σ = 33204133760. Its totient is φ = 14226680160.

The previous prime is 23121331283. The next prime is 23121331313. The reversal of 23121331311 is 11313312132.

It is a happy number.

It is not a de Polignac number, because 23121331311 - 2¹³ = 23121323119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121331313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308616 + ... + 376146.

It is an arithmetic number, because the mean of its divisors is an integer number (2075258360).

Almost surely, 2^23121331311 is an apocalyptic number.

23121331311 is a deficient number, since it is larger than the sum of its proper divisors (10082802449).

23121331311 is a wasteful number, since it uses less digits than its factorization.

23121331311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76326.

The product of its digits is 324, while the sum is 21.

Adding to 23121331311 its reverse (11313312132), we get a palindrome (34434643443).

The spelling of 23121331311 in words is "twenty-three billion, one hundred twenty-one million, three hundred thirty-one thousand, three hundred eleven".