133201021 has 2 divisors, whose sum is σ = 133201022. Its totient is φ = 133201020.

The previous prime is 133201007. The next prime is 133201051. The reversal of 133201021 is 120102331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117288900 + 15912121 = 10830^2 + 3989^2 .

It is a cyclic number.

It is not a de Polignac number, because 133201021 - 2¹⁵ = 133168253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133200992 and 133201010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133201051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66600510 + 66600511.

It is an arithmetic number, because the mean of its divisors is an integer number (66600511).

Almost surely, 2^133201021 is an apocalyptic number.

It is an amenable number.

133201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

133201021 is an equidigital number, since it uses as much as digits as its factorization.

133201021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 133201021 is about 11541.2746696368. The cubic root of 133201021 is about 510.7039120188.

Adding to 133201021 its reverse (120102331), we get a palindrome (253303352).

It can be divided in two parts, 13320 and 1021, that added together give a palindrome (14341).

The spelling of 133201021 in words is "one hundred thirty-three million, two hundred one thousand, twenty-one".