21666485132 has 6 divisors (see below), whose sum is σ = 37916348988. Its totient is φ = 10833242564.

The previous prime is 21666485119. The next prime is 21666485143. The reversal of 21666485132 is 23158466612.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2708310638 + ... + 2708310645.

It is an arithmetic number, because the mean of its divisors is an integer number (6319391498).

Almost surely, 2^21666485132 is an apocalyptic number.

It is an amenable number.

21666485132 is a deficient number, since it is larger than the sum of its proper divisors (16249863856).

21666485132 is a wasteful number, since it uses less digits than its factorization.

21666485132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416621287 (or 5416621285 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The spelling of 21666485132 in words is "twenty-one billion, six hundred sixty-six million, four hundred eighty-five thousand, one hundred thirty-two".