13021202121 has 4 divisors (see below), whose sum is σ = 17361602832. Its totient is φ = 8680801412.

The previous prime is 13021202111. The next prime is 13021202147. The reversal of 13021202121 is 12120212031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12120212031 = 3 ⋅4040070677.

It is a cyclic number.

It is not a de Polignac number, because 13021202121 - 2⁶ = 13021202057 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 13021202121.

It is not an unprimeable number, because it can be changed into a prime (13021202111) 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, 2170200351 + ... + 2170200356.

It is an arithmetic number, because the mean of its divisors is an integer number (4340400708).

Almost surely, 2^13021202121 is an apocalyptic number.

It is an amenable number.

13021202121 is a deficient number, since it is larger than the sum of its proper divisors (4340400711).

13021202121 is an equidigital number, since it uses as much as digits as its factorization.

13021202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4340400710.

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

Adding to 13021202121 its reverse (12120212031), we get a palindrome (25141414152).

The spelling of 13021202121 in words is "thirteen billion, twenty-one million, two hundred two thousand, one hundred twenty-one".