13020121221 has 8 divisors (see below), whose sum is σ = 18114951360. Its totient is φ = 8302685952.

The previous prime is 13020121199. The next prime is 13020121223. The reversal of 13020121221 is 12212102031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13020121221 - 2¹¹ = 13020119173 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13020121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13020121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94348636 + ... + 94348773.

It is an arithmetic number, because the mean of its divisors is an integer number (2264368920).

Almost surely, 2^13020121221 is an apocalyptic number.

It is an amenable number.

13020121221 is a deficient number, since it is larger than the sum of its proper divisors (5094830139).

13020121221 is a wasteful number, since it uses less digits than its factorization.

13020121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188697435.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 13020121221 its reverse (12212102031), we get a palindrome (25232223252).

The spelling of 13020121221 in words is "thirteen billion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".