23111313221 has 4 divisors (see below), whose sum is σ = 24470802252. Its totient is φ = 21751824192.

The previous prime is 23111313209. The next prime is 23111313259. The reversal of 23111313221 is 12231311132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12658500100 + 10452813121 = 112510^2 + 102239^2 .

It is a cyclic number.

It is not a de Polignac number, because 23111313221 - 2²² = 23107118917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23111313193 and 23111313202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23111313521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679744490 + ... + 679744523.

It is an arithmetic number, because the mean of its divisors is an integer number (6117700563).

Almost surely, 2^23111313221 is an apocalyptic number.

It is an amenable number.

23111313221 is a deficient number, since it is larger than the sum of its proper divisors (1359489031).

23111313221 is a wasteful number, since it uses less digits than its factorization.

23111313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359489030.

The product of its digits is 216, while the sum is 20.

Adding to 23111313221 its reverse (12231311132), we get a palindrome (35342624353).

The spelling of 23111313221 in words is "twenty-three billion, one hundred eleven million, three hundred thirteen thousand, two hundred twenty-one".