13020001221 has 4 divisors (see below), whose sum is σ = 17360001632. Its totient is φ = 8680000812.

The previous prime is 13020001219. The next prime is 13020001283. The reversal of 13020001221 is 12210002031.

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: 12210002031 = 3 ⋅4070000677.

It is not a de Polignac number, because 13020001221 - 2¹ = 13020001219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13020001197 and 13020001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13020001201) 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, 2170000201 + ... + 2170000206.

It is an arithmetic number, because the mean of its divisors is an integer number (4340000408).

Almost surely, 2^13020001221 is an apocalyptic number.

It is an amenable number.

13020001221 is a deficient number, since it is larger than the sum of its proper divisors (4340000411).

13020001221 is an equidigital number, since it uses as much as digits as its factorization.

13020001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4340000410.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 13020001221 its reverse (12210002031), we get a palindrome (25230003252).

The spelling of 13020001221 in words is "thirteen billion, twenty million, one thousand, two hundred twenty-one".