21271105273 has 4 divisors (see below), whose sum is σ = 23204842128. Its totient is φ = 19337368420.

The previous prime is 21271105267. The next prime is 21271105351. The reversal of 21271105273 is 37250117212.

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 21271105273 - 2⁵ = 21271105241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21271105243) 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, 966868411 + ... + 966868432.

It is an arithmetic number, because the mean of its divisors is an integer number (5801210532).

Almost surely, 2^21271105273 is an apocalyptic number.

It is an amenable number.

21271105273 is a deficient number, since it is larger than the sum of its proper divisors (1933736855).

21271105273 is a wasteful number, since it uses less digits than its factorization.

21271105273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933736854.

The product of its (nonzero) digits is 5880, while the sum is 31.

The spelling of 21271105273 in words is "twenty-one billion, two hundred seventy-one million, one hundred five thousand, two hundred seventy-three".