21632533002666 has 12 divisors (see below), whose sum is σ = 46870488172482. Its totient is φ = 7210844334216.

The previous prime is 21632533002637. The next prime is 21632533002667. The reversal of 21632533002666 is 66620033523612.

It can be written as a sum of positive squares in only one way, i.e., 21611759834025 + 20773168641 = 4648845^2 + 144129^2 .

It is a super-2 number, since 2×21632533002666² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21632533002667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 600903694501 + ... + 600903694536.

Almost surely, 2^{21632533002666} is an apocalyptic number.

21632533002666 is an abundant number, since it is smaller than the sum of its proper divisors (25237955169816).

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

21632533002666 is a wasteful number, since it uses less digits than its factorization.

21632533002666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201807389045 (or 1201807389042 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 45.

The spelling of 21632533002666 in words is "twenty-one trillion, six hundred thirty-two billion, five hundred thirty-three million, two thousand, six hundred sixty-six".