135421423573 has 2 divisors, whose sum is σ = 135421423574. Its totient is φ = 135421423572.

The previous prime is 135421423537. The next prime is 135421423607. The reversal of 135421423573 is 375324124531.

Together with previous prime (135421423537) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117352149489 + 18069274084 = 342567^2 + 134422^2 .

It is a cyclic number.

It is not a de Polignac number, because 135421423573 - 2²¹ = 135419326421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135421423873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67710711786 + 67710711787.

It is an arithmetic number, because the mean of its divisors is an integer number (67710711787).

Almost surely, 2^135421423573 is an apocalyptic number.

It is an amenable number.

135421423573 is a deficient number, since it is larger than the sum of its proper divisors (1).

135421423573 is an equidigital number, since it uses as much as digits as its factorization.

135421423573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 40.

The spelling of 135421423573 in words is "one hundred thirty-five billion, four hundred twenty-one million, four hundred twenty-three thousand, five hundred seventy-three".