21233636666 has 8 divisors (see below), whose sum is σ = 34745950944. Its totient is φ = 9651653020.

The previous prime is 21233636663. The next prime is 21233636681. The reversal of 21233636666 is 66663633212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21233636663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482582630 + ... + 482582673.

It is an arithmetic number, because the mean of its divisors is an integer number (4343243868).

Almost surely, 2^21233636666 is an apocalyptic number.

21233636666 is a deficient number, since it is larger than the sum of its proper divisors (13512314278).

21233636666 is a wasteful number, since it uses less digits than its factorization.

21233636666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965165316.

The product of its digits is 839808, while the sum is 44.

The spelling of 21233636666 in words is "twenty-one billion, two hundred thirty-three million, six hundred thirty-six thousand, six hundred sixty-six".