13123032123221 has 4 divisors (see below), whose sum is σ = 13252963134444. Its totient is φ = 12993101112000.

The previous prime is 13123032123191. The next prime is 13123032123251. The reversal of 13123032123221 is 12232123032131.

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

It is an interprime number because it is at equal distance from previous prime (13123032123191) and next prime (13123032123251).

It can be written as a sum of positive squares in 2 ways, for example, as 6156546975121 + 6966485148100 = 2481239^2 + 2639410^2 .

It is a cyclic number.

It is not a de Polignac number, because 13123032123221 - 2¹⁰ = 13123032122197 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 (13123032123251) 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, 64965505460 + ... + 64965505661.

It is an arithmetic number, because the mean of its divisors is an integer number (3313240783611).

Almost surely, 2^{13123032123221} is an apocalyptic number.

It is an amenable number.

13123032123221 is a deficient number, since it is larger than the sum of its proper divisors (129931011223).

13123032123221 is a wasteful number, since it uses less digits than its factorization.

13123032123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129931011222.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 13123032123221 its reverse (12232123032131), we get a palindrome (25355155155352).

The spelling of 13123032123221 in words is "thirteen trillion, one hundred twenty-three billion, thirty-two million, one hundred twenty-three thousand, two hundred twenty-one".