13221002121 has 8 divisors (see below), whose sum is σ = 17630211264. Its totient is φ = 8812897200.

The previous prime is 13221002083. The next prime is 13221002167. The reversal of 13221002121 is 12120012231.

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

It is not a de Polignac number, because 13221002121 - 2¹⁴ = 13220985737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221002121.

It is not an unprimeable number, because it can be changed into a prime (13221001121) 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, 247701 + ... + 296306.

It is an arithmetic number, because the mean of its divisors is an integer number (2203776408).

Almost surely, 2^13221002121 is an apocalyptic number.

It is an amenable number.

13221002121 is a deficient number, since it is larger than the sum of its proper divisors (4409209143).

13221002121 is an equidigital number, since it uses as much as digits as its factorization.

13221002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552111.

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

Adding to 13221002121 its reverse (12120012231), we get a palindrome (25341014352).

The spelling of 13221002121 in words is "thirteen billion, two hundred twenty-one million, two thousand, one hundred twenty-one".