21271035560 has 16 divisors (see below), whose sum is σ = 47859830100. Its totient is φ = 8508414208.

The previous prime is 21271035551. The next prime is 21271035607. The reversal of 21271035560 is 6553017212.

It can be written as a sum of positive squares in 2 ways, for example, as 19366062244 + 1904973316 = 139162^2 + 43646^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265887905 + ... + 265887984.

Almost surely, 2^21271035560 is an apocalyptic number.

21271035560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21271035560 is an abundant number, since it is smaller than the sum of its proper divisors (26588794540).

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

21271035560 is a wasteful number, since it uses less digits than its factorization.

21271035560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531775900 (or 531775896 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The spelling of 21271035560 in words is "twenty-one billion, two hundred seventy-one million, thirty-five thousand, five hundred sixty".