21131104432 has 20 divisors (see below), whose sum is σ = 41502359800. Its totient is φ = 10420818048.

The previous prime is 21131104427. The next prime is 21131104481. The reversal of 21131104432 is 23440113112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9044682 + ... + 9047017.

It is an arithmetic number, because the mean of its divisors is an integer number (2075117990).

Almost surely, 2^21131104432 is an apocalyptic number.

It is an amenable number.

21131104432 is a deficient number, since it is larger than the sum of its proper divisors (20371255368).

21131104432 is a wasteful number, since it uses less digits than its factorization.

21131104432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18091780 (or 18091774 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21131104432 its reverse (23440113112), we get a palindrome (44571217544).

The spelling of 21131104432 in words is "twenty-one billion, one hundred thirty-one million, one hundred four thousand, four hundred thirty-two".