23121332213221 has 16 divisors (see below), whose sum is σ = 25252779968640. Its totient is φ = 20994804564480.

The previous prime is 23121332213197. The next prime is 23121332213267. The reversal of 23121332213221 is 12231223312132.

It is a cyclic number.

It is not a de Polignac number, because 23121332213221 - 2²¹ = 23121330116069 is a prime.

It is a super-2 number, since 2×23121332213221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23121332213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121332213321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367387885 + ... + 367450813.

It is an arithmetic number, because the mean of its divisors is an integer number (1578298748040).

Almost surely, 2^{23121332213221} is an apocalyptic number.

It is an amenable number.

23121332213221 is a deficient number, since it is larger than the sum of its proper divisors (2131447755419).

23121332213221 is a wasteful number, since it uses less digits than its factorization.

23121332213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101484.

The product of its digits is 5184, while the sum is 28.

Adding to 23121332213221 its reverse (12231223312132), we get a palindrome (35352555525353).

The spelling of 23121332213221 in words is "twenty-three trillion, one hundred twenty-one billion, three hundred thirty-two million, two hundred thirteen thousand, two hundred twenty-one".