21020440132 has 12 divisors (see below), whose sum is σ = 37050417040. Its totient is φ = 10434606696.

The previous prime is 21020440121. The next prime is 21020440139. The reversal of 21020440132 is 23104402012.

It is not an unprimeable number, because it can be changed into a prime (21020440139) 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 3 ways as a sum of consecutive naturals, for example, 18902718 + ... + 18903829.

Almost surely, 2^21020440132 is an apocalyptic number.

It is an amenable number.

21020440132 is a deficient number, since it is larger than the sum of its proper divisors (16029976908).

21020440132 is a wasteful number, since it uses less digits than its factorization.

21020440132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37806690 (or 37806688 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21020440132 its reverse (23104402012), we get a palindrome (44124842144).

The spelling of 21020440132 in words is "twenty-one billion, twenty million, four hundred forty thousand, one hundred thirty-two".