13120221 has 8 divisors (see below), whose sum is σ = 17654560. Its totient is φ = 8666352.

The previous prime is 13120213. The next prime is 13120231. The reversal of 13120221 is 12202131.

13120221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13120221 - 2³ = 13120213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13120197 and 13120206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13120201) 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, 19735 + ... + 20388.

It is an arithmetic number, because the mean of its divisors is an integer number (2206820).

Almost surely, 2^13120221 is an apocalyptic number.

It is an amenable number.

13120221 is a deficient number, since it is larger than the sum of its proper divisors (4534339).

13120221 is a wasteful number, since it uses less digits than its factorization.

13120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40235.

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

The square root of 13120221 is about 3622.1845618356. The cubic root of 13120221 is about 235.8560658774.

Adding to 13120221 its reverse (12202131), we get a palindrome (25322352).

The spelling of 13120221 in words is "thirteen million, one hundred twenty thousand, two hundred twenty-one".