133232231221 has 2 divisors, whose sum is σ = 133232231222. Its totient is φ = 133232231220.

The previous prime is 133232231191. The next prime is 133232231287. The reversal of 133232231221 is 122132232331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129233060100 + 3999171121 = 359490^2 + 63239^2 .

It is a cyclic number.

It is not a de Polignac number, because 133232231221 - 2⁵ = 133232231189 is a prime.

It is a super-2 number, since 2×133232231221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133232231521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66616115610 + 66616115611.

It is an arithmetic number, because the mean of its divisors is an integer number (66616115611).

Almost surely, 2^133232231221 is an apocalyptic number.

It is an amenable number.

133232231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

133232231221 is an equidigital number, since it uses as much as digits as its factorization.

133232231221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 25.

Adding to 133232231221 its reverse (122132232331), we get a palindrome (255364463552).

The spelling of 133232231221 in words is "one hundred thirty-three billion, two hundred thirty-two million, two hundred thirty-one thousand, two hundred twenty-one".