133231221217 has 2 divisors, whose sum is σ = 133231221218. Its totient is φ = 133231221216.

The previous prime is 133231221161. The next prime is 133231221283. The reversal of 133231221217 is 712122132331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107926047441 + 25305173776 = 328521^2 + 159076^2 .

It is a cyclic number.

It is not a de Polignac number, because 133231221217 - 2¹⁵ = 133231188449 is a prime.

It is a super-2 number, since 2×133231221217² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133231221517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66615610608 + 66615610609.

It is an arithmetic number, because the mean of its divisors is an integer number (66615610609).

Almost surely, 2^133231221217 is an apocalyptic number.

It is an amenable number.

133231221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

133231221217 is an equidigital number, since it uses as much as digits as its factorization.

133231221217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

Adding to 133231221217 its reverse (712122132331), we get a palindrome (845353353548).

The spelling of 133231221217 in words is "one hundred thirty-three billion, two hundred thirty-one million, two hundred twenty-one thousand, two hundred seventeen".