21027148271 has 4 divisors (see below), whose sum is σ = 21315191472. Its totient is φ = 20739105072.

The previous prime is 21027148267. The next prime is 21027148283. The reversal of 21027148271 is 17284172012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21027148271 - 2² = 21027148267 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 (21027148201) 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 3 ways as a sum of consecutive naturals, for example, 144021491 + ... + 144021636.

It is an arithmetic number, because the mean of its divisors is an integer number (5328797868).

Almost surely, 2^21027148271 is an apocalyptic number.

21027148271 is a deficient number, since it is larger than the sum of its proper divisors (288043201).

21027148271 is an equidigital number, since it uses as much as digits as its factorization.

21027148271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288043200.

The product of its (nonzero) digits is 12544, while the sum is 35.

The spelling of 21027148271 in words is "twenty-one billion, twenty-seven million, one hundred forty-eight thousand, two hundred seventy-one".