21271270756 has 12 divisors (see below), whose sum is σ = 37282620592. Its totient is φ = 10619093448.

The previous prime is 21271270717. The next prime is 21271270771. The reversal of 21271270756 is 65707217212.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 4132590 + ... + 4137733.

Almost surely, 2^21271270756 is an apocalyptic number.

It is an amenable number.

21271270756 is a deficient number, since it is larger than the sum of its proper divisors (16011349836).

21271270756 is a wasteful number, since it uses less digits than its factorization.

21271270756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8270970 (or 8270968 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 40.

Adding to 21271270756 its reverse (65707217212), we get a palindrome (86978487968).

The spelling of 21271270756 in words is "twenty-one billion, two hundred seventy-one million, two hundred seventy thousand, seven hundred fifty-six".