23111323201221 has 16 divisors (see below), whose sum is σ = 31043390945280. Its totient is φ = 15293449286640.

The previous prime is 23111323201147. The next prime is 23111323201229. The reversal of 23111323201221 is 12210232311132.

It is not a de Polignac number, because 23111323201221 - 2²² = 23111319006917 is a prime.

It is a super-2 number, since 2×23111323201221² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23111323201191 and 23111323201200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23111323201229) 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, 3931135 + ... + 7853436.

It is an arithmetic number, because the mean of its divisors is an integer number (1940211934080).

Almost surely, 2^{23111323201221} is an apocalyptic number.

It is an amenable number.

23111323201221 is a deficient number, since it is larger than the sum of its proper divisors (7932067744059).

23111323201221 is a wasteful number, since it uses less digits than its factorization.

23111323201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11789416.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 23111323201221 its reverse (12210232311132), we get a palindrome (35321555512353).

The spelling of 23111323201221 in words is "twenty-three trillion, one hundred eleven billion, three hundred twenty-three million, two hundred one thousand, two hundred twenty-one".