133421251 has 2 divisors, whose sum is σ = 133421252. Its totient is φ = 133421250.

The previous prime is 133421227. The next prime is 133421263. The reversal of 133421251 is 152124331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133421251 - 2¹¹ = 133419203 is a prime.

It is not a weakly prime, because it can be changed into another prime (133421201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66710625 + 66710626.

It is an arithmetic number, because the mean of its divisors is an integer number (66710626).

Almost surely, 2^133421251 is an apocalyptic number.

133421251 is a deficient number, since it is larger than the sum of its proper divisors (1).

133421251 is an equidigital number, since it uses as much as digits as its factorization.

133421251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 133421251 is about 11550.8117030796. The cubic root of 133421251 is about 510.9852171535.

Adding to 133421251 its reverse (152124331), we get a palindrome (285545582).

The spelling of 133421251 in words is "one hundred thirty-three million, four hundred twenty-one thousand, two hundred fifty-one".