21271044160 has 84 divisors (see below), whose sum is σ = 53458151148. Its totient is φ = 8060562432.

The previous prime is 21271044139. The next prime is 21271044163. The reversal of 21271044160 is 6144017212.

It can be written as a sum of positive squares in 2 ways, for example, as 12617579584 + 8653464576 = 112328^2 + 93024^2 .

It is not an unprimeable number, because it can be changed into a prime (21271044163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23454 + ... + 207586.

Almost surely, 2^21271044160 is an apocalyptic number.

21271044160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21271044160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26729075574).

21271044160 is an abundant number, since it is smaller than the sum of its proper divisors (32187106988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21271044160 is a wasteful number, since it uses less digits than its factorization.

21271044160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184188 (or 184159 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 21271044160 in words is "twenty-one billion, two hundred seventy-one million, forty-four thousand, one hundred sixty".