21052132684 has 24 divisors (see below), whose sum is σ = 40290694416. Its totient is φ = 9545280000.

The previous prime is 21052132679. The next prime is 21052132687. The reversal of 21052132684 is 48623125012.

It is not an unprimeable number, because it can be changed into a prime (21052132687) by changing a digit.

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, 578937 + ... + 614224.

It is an arithmetic number, because the mean of its divisors is an integer number (1678778934).

Almost surely, 2^21052132684 is an apocalyptic number.

It is an amenable number.

21052132684 is a deficient number, since it is larger than the sum of its proper divisors (19238561732).

21052132684 is a wasteful number, since it uses less digits than its factorization.

21052132684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193577 (or 1193575 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 21052132684 its reverse (48623125012), we get a palindrome (69675257696).

The spelling of 21052132684 in words is "twenty-one billion, fifty-two million, one hundred thirty-two thousand, six hundred eighty-four".