133221013 has 4 divisors (see below), whose sum is σ = 136470348. Its totient is φ = 129971680.

The previous prime is 133220987. The next prime is 133221017. The reversal of 133221013 is 310122331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6140484 + 127080529 = 2478^2 + 11273^2 .

It is a cyclic number.

It is not a de Polignac number, because 133221013 - 2¹⁷ = 133089941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133221017) 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, 1624606 + ... + 1624687.

It is an arithmetic number, because the mean of its divisors is an integer number (34117587).

Almost surely, 2^133221013 is an apocalyptic number.

It is an amenable number.

133221013 is a deficient number, since it is larger than the sum of its proper divisors (3249335).

133221013 is an equidigital number, since it uses as much as digits as its factorization.

133221013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249334.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 133221013 is about 11542.1407459795. The cubic root of 133221013 is about 510.7294610768.

Adding to 133221013 its reverse (310122331), we get a palindrome (443343344).

The spelling of 133221013 in words is "one hundred thirty-three million, two hundred twenty-one thousand, thirteen".