13121221223 has 4 divisors (see below), whose sum is σ = 14314059528. Its totient is φ = 11928382920.

The previous prime is 13121221219. The next prime is 13121221247. The reversal of 13121221223 is 32212212131.

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

It is a cyclic number.

It is not a de Polignac number, because 13121221223 - 2² = 13121221219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13121221195 and 13121221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121221213) 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, 596419136 + ... + 596419157.

It is an arithmetic number, because the mean of its divisors is an integer number (3578514882).

Almost surely, 2^13121221223 is an apocalyptic number.

13121221223 is a deficient number, since it is larger than the sum of its proper divisors (1192838305).

13121221223 is a wasteful number, since it uses less digits than its factorization.

13121221223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192838304.

The product of its digits is 288, while the sum is 20.

Adding to 13121221223 its reverse (32212212131), we get a palindrome (45333433354).

The spelling of 13121221223 in words is "thirteen billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-three".