133680210221 has 2 divisors, whose sum is σ = 133680210222. Its totient is φ = 133680210220.

The previous prime is 133680210211. The next prime is 133680210233. The reversal of 133680210221 is 122012086331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109303633321 + 24376576900 = 330611^2 + 156130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133680210221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133680210211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66840105110 + 66840105111.

It is an arithmetic number, because the mean of its divisors is an integer number (66840105111).

Almost surely, 2^133680210221 is an apocalyptic number.

It is an amenable number.

133680210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

133680210221 is an equidigital number, since it uses as much as digits as its factorization.

133680210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 133680210221 its reverse (122012086331), we get a palindrome (255692296552).

The spelling of 133680210221 in words is "one hundred thirty-three billion, six hundred eighty million, two hundred ten thousand, two hundred twenty-one".