133303021 has 2 divisors, whose sum is σ = 133303022. Its totient is φ = 133303020.

The previous prime is 133303019. The next prime is 133303033. The reversal of 133303021 is 120303331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127373796 + 5929225 = 11286^2 + 2435^2 .

It is an emirp because it is prime and its reverse (120303331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133303021 - 2¹ = 133303019 is a prime.

Together with 133303019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 133302986 and 133303004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133303081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66651510 + 66651511.

It is an arithmetic number, because the mean of its divisors is an integer number (66651511).

Almost surely, 2^133303021 is an apocalyptic number.

It is an amenable number.

133303021 is a deficient number, since it is larger than the sum of its proper divisors (1).

133303021 is an equidigital number, since it uses as much as digits as its factorization.

133303021 is an evil number, because the sum of its binary digits is even.

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

The square root of 133303021 is about 11545.6927466480. The cubic root of 133303021 is about 510.8342376166.

Adding to 133303021 its reverse (120303331), we get a palindrome (253606352).

The spelling of 133303021 in words is "one hundred thirty-three million, three hundred three thousand, twenty-one".