21271588913 has 8 divisors (see below), whose sum is σ = 21533833800. Its totient is φ = 21009860608.

The previous prime is 21271588883. The next prime is 21271588931. The reversal of 21271588913 is 31988517212.

It can be written as a sum of positive squares in 4 ways, for example, as 2585519104 + 18686069809 = 50848^2 + 136697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21271588913 - 2¹⁰ = 21271587889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21271581913) 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 7 ways as a sum of consecutive naturals, for example, 45956 + ... + 211317.

It is an arithmetic number, because the mean of its divisors is an integer number (2691729225).

Almost surely, 2^21271588913 is an apocalyptic number.

It is an amenable number.

21271588913 is a deficient number, since it is larger than the sum of its proper divisors (262244887).

21271588913 is an equidigital number, since it uses as much as digits as its factorization.

21271588913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258291.

The product of its digits is 241920, while the sum is 47.

The spelling of 21271588913 in words is "twenty-one billion, two hundred seventy-one million, five hundred eighty-eight thousand, nine hundred thirteen".