21816771066 has 32 divisors (see below), whose sum is σ = 48486669120. Its totient is φ = 7271513712.

The previous prime is 21816771043. The next prime is 21816771077. The reversal of 21816771066 is 66017761812.

It is a hoax number, since the sum of its digits (45) 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 15 ways as a sum of consecutive naturals, for example, 847156 + ... + 872528.

It is an arithmetic number, because the mean of its divisors is an integer number (1515208410).

Almost surely, 2^21816771066 is an apocalyptic number.

21816771066 is an abundant number, since it is smaller than the sum of its proper divisors (26669898054).

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

21816771066 is a wasteful number, since it uses less digits than its factorization.

21816771066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41307 (or 41301 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 21816771066 in words is "twenty-one billion, eight hundred sixteen million, seven hundred seventy-one thousand, sixty-six".