21029130873 has 16 divisors (see below), whose sum is σ = 31682308800. Its totient is φ = 13781802240.

The previous prime is 21029130833. The next prime is 21029130887. The reversal of 21029130873 is 37803192012.

It is not a de Polignac number, because 21029130873 - 2⁹ = 21029130361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21029130833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6598888 + ... + 6602073.

It is an arithmetic number, because the mean of its divisors is an integer number (1980144300).

Almost surely, 2^21029130873 is an apocalyptic number.

It is an amenable number.

21029130873 is a deficient number, since it is larger than the sum of its proper divisors (10653177927).

21029130873 is a wasteful number, since it uses less digits than its factorization.

21029130873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13201029 (or 13201023 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 21029130873 in words is "twenty-one billion, twenty-nine million, one hundred thirty thousand, eight hundred seventy-three".