133205145331421 has 2 divisors, whose sum is σ = 133205145331422. Its totient is φ = 133205145331420.

The previous prime is 133205145331403. The next prime is 133205145331507. The reversal of 133205145331421 is 124133541502331.

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., 124683352468900 + 8521792862521 = 11166170^2 + 2919211^2 .

It is a cyclic number.

It is not a de Polignac number, because 133205145331421 - 2¹⁴ = 133205145315037 is a prime.

It is a super-2 number, since 2×133205145331421² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133205145336421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66602572665710 + 66602572665711.

It is an arithmetic number, because the mean of its divisors is an integer number (66602572665711).

Almost surely, 2^{133205145331421} is an apocalyptic number.

It is an amenable number.

133205145331421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133205145331421 is an equidigital number, since it uses as much as digits as its factorization.

133205145331421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 133205145331421 its reverse (124133541502331), we get a palindrome (257338686833752).

The spelling of 133205145331421 in words is "one hundred thirty-three trillion, two hundred five billion, one hundred forty-five million, three hundred thirty-one thousand, four hundred twenty-one".