8153729821 has 4 divisors (see below), whose sum is σ = 8175244000. Its totient is φ = 8132215644.

The previous prime is 8153729791. The next prime is 8153729921. The reversal of 8153729821 is 1289273518.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 8153729821 - 2¹³ = 8153721629 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 (8153729021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10756521 + ... + 10757278.

It is an arithmetic number, because the mean of its divisors is an integer number (2043811000).

Almost surely, 2^8153729821 is an apocalyptic number.

It is an amenable number.

8153729821 is a deficient number, since it is larger than the sum of its proper divisors (21514179).

8153729821 is a wasteful number, since it uses less digits than its factorization.

8153729821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21514178.

The product of its digits is 241920, while the sum is 46.

The square root of 8153729821 is about 90298.0056313538. The cubic root of 8153729821 is about 2012.7296248464.

The spelling of 8153729821 in words is "eight billion, one hundred fifty-three million, seven hundred twenty-nine thousand, eight hundred twenty-one".