133415221 has 2 divisors, whose sum is σ = 133415222. Its totient is φ = 133415220.

The previous prime is 133415077. The next prime is 133415251. The reversal of 133415221 is 122514331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69639025 + 63776196 = 8345^2 + 7986^2 .

It is a cyclic number.

It is not a de Polignac number, because 133415221 - 2¹⁵ = 133382453 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 133415192 and 133415201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133415251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66707610 + 66707611.

It is an arithmetic number, because the mean of its divisors is an integer number (66707611).

Almost surely, 2^133415221 is an apocalyptic number.

It is an amenable number.

133415221 is a deficient number, since it is larger than the sum of its proper divisors (1).

133415221 is an equidigital number, since it uses as much as digits as its factorization.

133415221 is an evil number, because the sum of its binary digits is even.

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

The square root of 133415221 is about 11550.5506795131. The cubic root of 133415221 is about 510.9775190113.

Adding to 133415221 its reverse (122514331), we get a palindrome (255929552).

The spelling of 133415221 in words is "one hundred thirty-three million, four hundred fifteen thousand, two hundred twenty-one".