21233133686 has 16 divisors (see below), whose sum is σ = 32717843136. Its totient is φ = 10327314816.

The previous prime is 21233133659. The next prime is 21233133709. The reversal of 21233133686 is 68633133212.

It is a super-2 number, since 2×21233133686² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326675 + ... + 386241.

It is an arithmetic number, because the mean of its divisors is an integer number (2044865196).

Almost surely, 2^21233133686 is an apocalyptic number.

21233133686 is a deficient number, since it is larger than the sum of its proper divisors (11484709450).

21233133686 is a wasteful number, since it uses less digits than its factorization.

21233133686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64423.

The product of its digits is 93312, while the sum is 38.

Adding to 21233133686 its reverse (68633133212), we get a palindrome (89866266898).

The spelling of 21233133686 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirty-three thousand, six hundred eighty-six".