21271278858 has 16 divisors (see below), whose sum is σ = 43177522080. Its totient is φ = 6984598896.

The previous prime is 21271278841. The next prime is 21271278871. The reversal of 21271278858 is 85887217212.

It is a happy number.

21271278858 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21271278858.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26456413 + ... + 26457216.

It is an arithmetic number, because the mean of its divisors is an integer number (2698595130).

Almost surely, 2^21271278858 is an apocalyptic number.

21271278858 is an abundant number, since it is smaller than the sum of its proper divisors (21906243222).

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

21271278858 is a wasteful number, since it uses less digits than its factorization.

21271278858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52913701.

The product of its digits is 1003520, while the sum is 51.

The spelling of 21271278858 in words is "twenty-one billion, two hundred seventy-one million, two hundred seventy-eight thousand, eight hundred fifty-eight".