23121513021205 has 16 divisors (see below), whose sum is σ = 29348760314880. Its totient is φ = 17450614228608.

The previous prime is 23121513021163. The next prime is 23121513021227. The reversal of 23121513021205 is 50212031512132.

It is a cyclic number.

It is not a de Polignac number, because 23121513021205 - 2¹⁵ = 23121512988437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1377091845 + ... + 1377108634.

It is an arithmetic number, because the mean of its divisors is an integer number (1834297519680).

Almost surely, 2^{23121513021205} is an apocalyptic number.

It is an amenable number.

23121513021205 is a deficient number, since it is larger than the sum of its proper divisors (6227247293675).

23121513021205 is a wasteful number, since it uses less digits than its factorization.

23121513021205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754200580.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 23121513021205 its reverse (50212031512132), we get a palindrome (73333544533337).

The spelling of 23121513021205 in words is "twenty-three trillion, one hundred twenty-one billion, five hundred thirteen million, twenty-one thousand, two hundred five".