21132394736 has 10 divisors (see below), whose sum is σ = 40944014832. Its totient is φ = 10566197360.

The previous prime is 21132394727. The next prime is 21132394747. The reversal of 21132394736 is 63749323112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21132394693 and 21132394702.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 660387320 + ... + 660387351.

Almost surely, 2^21132394736 is an apocalyptic number.

It is an amenable number.

21132394736 is a deficient number, since it is larger than the sum of its proper divisors (19811620096).

21132394736 is a wasteful number, since it uses less digits than its factorization.

21132394736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320774679 (or 1320774673 counting only the distinct ones).

The product of its digits is 163296, while the sum is 41.

The spelling of 21132394736 in words is "twenty-one billion, one hundred thirty-two million, three hundred ninety-four thousand, seven hundred thirty-six".