21005271752 has 16 divisors (see below), whose sum is σ = 39393043200. Its totient is φ = 10500460240.

The previous prime is 21005271751. The next prime is 21005271787. The reversal of 21005271752 is 25717250012.

It is not an unprimeable number, because it can be changed into a prime (21005271751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230552 + ... + 308487.

It is an arithmetic number, because the mean of its divisors is an integer number (2462065200).

Almost surely, 2^21005271752 is an apocalyptic number.

It is an amenable number.

21005271752 is a deficient number, since it is larger than the sum of its proper divisors (18387771448).

21005271752 is a wasteful number, since it uses less digits than its factorization.

21005271752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543916 (or 543912 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

The spelling of 21005271752 in words is "twenty-one billion, five million, two hundred seventy-one thousand, seven hundred fifty-two".