135261342621 has 6 divisors (see below), whose sum is σ = 195377494910. Its totient is φ = 90174228408.

The previous prime is 135261342577. The next prime is 135261342637. The reversal of 135261342621 is 126243162531.

135261342621 is a `hidden beast` number, since 1 + 3 + 5 + 26 + 1 + 3 + 4 + 2 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 105647751225 + 29613591396 = 325035^2 + 172086^2 .

It is not a de Polignac number, because 135261342621 - 2¹⁴ = 135261326237 is a prime.

It is a super-2 number, since 2×135261342621² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135261342691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7514519026 + ... + 7514519043.

Almost surely, 2^135261342621 is an apocalyptic number.

It is an amenable number.

135261342621 is a deficient number, since it is larger than the sum of its proper divisors (60116152289).

135261342621 is a wasteful number, since it uses less digits than its factorization.

135261342621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15029038075 (or 15029038072 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The spelling of 135261342621 in words is "one hundred thirty-five billion, two hundred sixty-one million, three hundred forty-two thousand, six hundred twenty-one".