135263869921 has 4 divisors (see below), whose sum is σ = 135274159152. Its totient is φ = 135253580692.

The previous prime is 135263869847. The next prime is 135263869943. The reversal of 135263869921 is 129968362531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129968362531 = 7 ⋅18566908933.

It is a cyclic number.

It is not a de Polignac number, because 135263869921 - 2¹¹ = 135263867873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135263869021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124871 + ... + 5151196.

It is an arithmetic number, because the mean of its divisors is an integer number (33818539788).

Almost surely, 2^135263869921 is an apocalyptic number.

It is an amenable number.

135263869921 is a deficient number, since it is larger than the sum of its proper divisors (10289231).

135263869921 is a wasteful number, since it uses less digits than its factorization.

135263869921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10289230.

The product of its digits is 4199040, while the sum is 55.

The spelling of 135263869921 in words is "one hundred thirty-five billion, two hundred sixty-three million, eight hundred sixty-nine thousand, nine hundred twenty-one".