135574567421 has 2 divisors, whose sum is σ = 135574567422. Its totient is φ = 135574567420.

The previous prime is 135574567397. The next prime is 135574567451. The reversal of 135574567421 is 124765475531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88750368100 + 46824199321 = 297910^2 + 216389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135574567421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135574567421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135574567451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67787283710 + 67787283711.

It is an arithmetic number, because the mean of its divisors is an integer number (67787283711).

Almost surely, 2^135574567421 is an apocalyptic number.

It is an amenable number.

135574567421 is a deficient number, since it is larger than the sum of its proper divisors (1).

135574567421 is an equidigital number, since it uses as much as digits as its factorization.

135574567421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528000, while the sum is 50.

The spelling of 135574567421 in words is "one hundred thirty-five billion, five hundred seventy-four million, five hundred sixty-seven thousand, four hundred twenty-one".