21030118273 has 4 divisors (see below), whose sum is σ = 21032275968. Its totient is φ = 21027960580.

The previous prime is 21030118261. The next prime is 21030118283. The reversal of 21030118273 is 37281103012.

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 21030118273 - 2²⁹ = 20493247361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030118223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064161 + ... + 1083742.

It is an arithmetic number, because the mean of its divisors is an integer number (5258068992).

Almost surely, 2^21030118273 is an apocalyptic number.

It is an amenable number.

21030118273 is a deficient number, since it is larger than the sum of its proper divisors (2157695).

21030118273 is an equidigital number, since it uses as much as digits as its factorization.

21030118273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157694.

The product of its (nonzero) digits is 2016, while the sum is 28.

The spelling of 21030118273 in words is "twenty-one billion, thirty million, one hundred eighteen thousand, two hundred seventy-three".