21130432042 has 8 divisors (see below), whose sum is σ = 31768849476. Its totient is φ = 10540815552.

The previous prime is 21130432033. The next prime is 21130432073. The reversal of 21130432042 is 24023403112.

It can be written as a sum of positive squares in 2 ways, for example, as 17482392841 + 3648039201 = 132221^2 + 60399^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12199153 + ... + 12200884.

Almost surely, 2^21130432042 is an apocalyptic number.

21130432042 is a deficient number, since it is larger than the sum of its proper divisors (10638417434).

21130432042 is a wasteful number, since it uses less digits than its factorization.

21130432042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24400472.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21130432042 its reverse (24023403112), we get a palindrome (45153835154).

The spelling of 21130432042 in words is "twenty-one billion, one hundred thirty million, four hundred thirty-two thousand, forty-two".