21536271066 has 16 divisors (see below), whose sum is σ = 43074216000. Its totient is φ = 7178478048.

The previous prime is 21536271049. The next prime is 21536271079. The reversal of 21536271066 is 66017263512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151510 + ... + 256958.

It is an arithmetic number, because the mean of its divisors is an integer number (2692138500).

Almost surely, 2^21536271066 is an apocalyptic number.

21536271066 is an abundant number, since it is smaller than the sum of its proper divisors (21537944934).

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

21536271066 is a wasteful number, since it uses less digits than its factorization.

21536271066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139493.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 21536271066 in words is "twenty-one billion, five hundred thirty-six million, two hundred seventy-one thousand, sixty-six".