13220120021 has 4 divisors (see below), whose sum is σ = 13794907872. Its totient is φ = 12645332172.

The previous prime is 13220119999. The next prime is 13220120047. The reversal of 13220120021 is 12002102231.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 13220120021 - 2¹⁰ = 13220118997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13220119978 and 13220120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220120071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287393891 + ... + 287393936.

It is an arithmetic number, because the mean of its divisors is an integer number (3448726968).

Almost surely, 2^13220120021 is an apocalyptic number.

It is an amenable number.

13220120021 is a deficient number, since it is larger than the sum of its proper divisors (574787851).

13220120021 is an equidigital number, since it uses as much as digits as its factorization.

13220120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574787850.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 13220120021 its reverse (12002102231), we get a palindrome (25222222252).

The spelling of 13220120021 in words is "thirteen billion, two hundred twenty million, one hundred twenty thousand, twenty-one".