21286539158 has 16 divisors (see below), whose sum is σ = 32179956480. Its totient is φ = 10560057000.

The previous prime is 21286539151. The next prime is 21286539191. The reversal of 21286539158 is 85193568212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21286539151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211373 + ... + 295383.

It is an arithmetic number, because the mean of its divisors is an integer number (2011247280).

Almost surely, 2^21286539158 is an apocalyptic number.

21286539158 is a deficient number, since it is larger than the sum of its proper divisors (10893417322).

21286539158 is a wasteful number, since it uses less digits than its factorization.

21286539158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85003.

The product of its digits is 1036800, while the sum is 50.

The spelling of 21286539158 in words is "twenty-one billion, two hundred eighty-six million, five hundred thirty-nine thousand, one hundred fifty-eight".