133745221 has 8 divisors (see below), whose sum is σ = 136877184. Its totient is φ = 130625280.

The previous prime is 133745203. The next prime is 133745243. The reversal of 133745221 is 122547331.

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

It is a cyclic number.

It is not a de Polignac number, because 133745221 - 2⁵ = 133745189 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 133745221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133742221) 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, 21861 + ... + 27301.

It is an arithmetic number, because the mean of its divisors is an integer number (17109648).

Almost surely, 2^133745221 is an apocalyptic number.

It is an amenable number.

133745221 is a deficient number, since it is larger than the sum of its proper divisors (3131963).

133745221 is an equidigital number, since it uses as much as digits as its factorization.

133745221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6011.

The product of its digits is 5040, while the sum is 28.

The square root of 133745221 is about 11564.8268901873. The cubic root of 133745221 is about 511.3984698406.

The spelling of 133745221 in words is "one hundred thirty-three million, seven hundred forty-five thousand, two hundred twenty-one".