133113221 has 4 divisors (see below), whose sum is σ = 140119200. Its totient is φ = 126107244.

The previous prime is 133113199. The next prime is 133113229. The reversal of 133113221 is 122311331.

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 133113221 - 2¹⁸ = 132851077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133113221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133113229) 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, 3502961 + ... + 3502998.

It is an arithmetic number, because the mean of its divisors is an integer number (35029800).

Almost surely, 2^133113221 is an apocalyptic number.

It is an amenable number.

133113221 is a deficient number, since it is larger than the sum of its proper divisors (7005979).

133113221 is an equidigital number, since it uses as much as digits as its factorization.

133113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7005978.

The product of its digits is 108, while the sum is 17.

The square root of 133113221 is about 11537.4703033204. The cubic root of 133113221 is about 510.5916764947.

Adding to 133113221 its reverse (122311331), we get a palindrome (255424552).

The spelling of 133113221 in words is "one hundred thirty-three million, one hundred thirteen thousand, two hundred twenty-one".