133330021 has 6 divisors (see below), whose sum is σ = 146552966. Its totient is φ = 121209000.

The previous prime is 133330013. The next prime is 133330027. The reversal of 133330021 is 120033331.

It can be written as a sum of positive squares in only one way, i.e., 118592100 + 14737921 = 10890^2 + 3839^2 .

It is not a de Polignac number, because 133330021 - 2³ = 133330013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133329977 and 133330004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133330027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 550830 + ... + 551071.

Almost surely, 2^133330021 is an apocalyptic number.

133330021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133330021 is a deficient number, since it is larger than the sum of its proper divisors (13222945).

133330021 is a wasteful number, since it uses less digits than its factorization.

133330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101923 (or 1101912 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 133330021 is about 11546.8619546611. The cubic root of 133330021 is about 510.8687244402.

Adding to 133330021 its reverse (120033331), we get a palindrome (253363352).

The spelling of 133330021 in words is "one hundred thirty-three million, three hundred thirty thousand, twenty-one".