133401556457321 has 2 divisors, whose sum is σ = 133401556457322. Its totient is φ = 133401556457320.

The previous prime is 133401556457317. The next prime is 133401556457359. The reversal of 133401556457321 is 123754655104331.

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., 132696829786921 + 704726670400 = 11519411^2 + 839480^2 .

It is an emirp because it is prime and its reverse (123754655104331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133401556457321 - 2² = 133401556457317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133401556457321.

It is not a weakly prime, because it can be changed into another prime (133401556457021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66700778228660 + 66700778228661.

It is an arithmetic number, because the mean of its divisors is an integer number (66700778228661).

Almost surely, 2^{133401556457321} is an apocalyptic number.

It is an amenable number.

133401556457321 is a deficient number, since it is larger than the sum of its proper divisors (1).

133401556457321 is an equidigital number, since it uses as much as digits as its factorization.

133401556457321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000, while the sum is 50.

The spelling of 133401556457321 in words is "one hundred thirty-three trillion, four hundred one billion, five hundred fifty-six million, four hundred fifty-seven thousand, three hundred twenty-one".