21271312260 has 96 divisors (see below), whose sum is σ = 72193564800. Its totient is φ = 5156680320.

The previous prime is 21271312259. The next prime is 21271312273. The reversal of 21271312260 is 6221317212.

21271312260 is a `hidden beast` number, since 21 + 2 + 71 + 312 + 260 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1784575 + ... + 1796454.

It is an arithmetic number, because the mean of its divisors is an integer number (752016300).

Almost surely, 2^21271312260 is an apocalyptic number.

21271312260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21271312260 is an abundant number, since it is smaller than the sum of its proper divisors (50922252540).

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

21271312260 is a wasteful number, since it uses less digits than its factorization.

21271312260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581058 (or 3581050 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

Adding to 21271312260 its reverse (6221317212), we get a palindrome (27492629472).

The spelling of 21271312260 in words is "twenty-one billion, two hundred seventy-one million, three hundred twelve thousand, two hundred sixty".