21278256140871 has 32 divisors (see below), whose sum is σ = 31718491057920. Its totient is φ = 14097696842592.

The previous prime is 21278256140849. The next prime is 21278256140893. The reversal of 21278256140871 is 17804165287212.

21278256140871 is a `hidden beast` number, since 2 + 1 + 2 + 7 + 8 + 2 + 561 + 4 + 0 + 8 + 71 = 666.

It is an interprime number because it is at equal distance from previous prime (21278256140849) and next prime (21278256140893).

It is not a de Polignac number, because 21278256140871 - 2⁹ = 21278256140359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21278256140831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85726381 + ... + 85974233.

It is an arithmetic number, because the mean of its divisors is an integer number (991202845560).

Almost surely, 2^{21278256140871} is an apocalyptic number.

21278256140871 is a deficient number, since it is larger than the sum of its proper divisors (10440234917049).

21278256140871 is a wasteful number, since it uses less digits than its factorization.

21278256140871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267532 (or 267526 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 54.

The spelling of 21278256140871 in words is "twenty-one trillion, two hundred seventy-eight billion, two hundred fifty-six million, one hundred forty thousand, eight hundred seventy-one".