135451452444221 has 2 divisors, whose sum is σ = 135451452444222. Its totient is φ = 135451452444220.

The previous prime is 135451452444163. The next prime is 135451452444233. The reversal of 135451452444221 is 122444254154531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115742869324996 + 19708583119225 = 10758386^2 + 4439435^2 .

It is a cyclic number.

It is not a de Polignac number, because 135451452444221 - 2²² = 135451448249917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135451452444421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67725726222110 + 67725726222111.

It is an arithmetic number, because the mean of its divisors is an integer number (67725726222111).

Almost surely, 2^{135451452444221} is an apocalyptic number.

It is an amenable number.

135451452444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

135451452444221 is an equidigital number, since it uses as much as digits as its factorization.

135451452444221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072000, while the sum is 47.

The spelling of 135451452444221 in words is "one hundred thirty-five trillion, four hundred fifty-one billion, four hundred fifty-two million, four hundred forty-four thousand, two hundred twenty-one".