133431240424421 has 2 divisors, whose sum is σ = 133431240424422. Its totient is φ = 133431240424420.

The previous prime is 133431240424409. The next prime is 133431240424439. The reversal of 133431240424421 is 124424042134331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102945658533796 + 30485581890625 = 10146214^2 + 5521375^2 .

It is a cyclic number.

It is not a de Polignac number, because 133431240424421 - 2⁶ = 133431240424357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133431240423421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66715620212210 + 66715620212211.

It is an arithmetic number, because the mean of its divisors is an integer number (66715620212211).

Almost surely, 2^{133431240424421} is an apocalyptic number.

It is an amenable number.

133431240424421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133431240424421 is an equidigital number, since it uses as much as digits as its factorization.

133431240424421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 38.

Adding to 133431240424421 its reverse (124424042134331), we get a palindrome (257855282558752).

The spelling of 133431240424421 in words is "one hundred thirty-three trillion, four hundred thirty-one billion, two hundred forty million, four hundred twenty-four thousand, four hundred twenty-one".