921165853133 has 4 divisors (see below), whose sum is σ = 946062227580. Its totient is φ = 896269478688.

The previous prime is 921165853129. The next prime is 921165853183. The reversal of 921165853133 is 331358561129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 532685401609 + 388480451524 = 729853^2 + 623282^2 .

It is not a de Polignac number, because 921165853133 - 2² = 921165853129 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921165853103) 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 3 ways as a sum of consecutive naturals, for example, 12448187168 + ... + 12448187241.

It is an arithmetic number, because the mean of its divisors is an integer number (236515556895).

Almost surely, 2^921165853133 is an apocalyptic number.

It is an amenable number.

921165853133 is a deficient number, since it is larger than the sum of its proper divisors (24896374447).

921165853133 is a wasteful number, since it uses less digits than its factorization.

921165853133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24896374446.

The product of its digits is 583200, while the sum is 47.

The spelling of 921165853133 in words is "nine hundred twenty-one billion, one hundred sixty-five million, eight hundred fifty-three thousand, one hundred thirty-three".