133030021 has 4 divisors (see below), whose sum is σ = 137321344. Its totient is φ = 128738700.

The previous prime is 133030019. The next prime is 133030033. The reversal of 133030021 is 120030331.

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 133030021 - 2¹ = 133030019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133029983 and 133030010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133030621) 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, 2145615 + ... + 2145676.

It is an arithmetic number, because the mean of its divisors is an integer number (34330336).

Almost surely, 2^133030021 is an apocalyptic number.

It is an amenable number.

133030021 is a deficient number, since it is larger than the sum of its proper divisors (4291323).

133030021 is an equidigital number, since it uses as much as digits as its factorization.

133030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291322.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 133030021 is about 11533.8640966504. The cubic root of 133030021 is about 510.4852756405.

Adding to 133030021 its reverse (120030331), we get a palindrome (253060352).

The spelling of 133030021 in words is "one hundred thirty-three million, thirty thousand, twenty-one".