21432112124 has 6 divisors (see below), whose sum is σ = 37506196224. Its totient is φ = 10716056060.

The previous prime is 21432112099. The next prime is 21432112127. The reversal of 21432112124 is 42121123412.

It is a self number, because there is not a number n which added to its sum of digits gives 21432112124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432112127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2679014012 + ... + 2679014019.

It is an arithmetic number, because the mean of its divisors is an integer number (6251032704).

Almost surely, 2^21432112124 is an apocalyptic number.

It is an amenable number.

21432112124 is a deficient number, since it is larger than the sum of its proper divisors (16074084100).

21432112124 is a wasteful number, since it uses less digits than its factorization.

21432112124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5358028035 (or 5358028033 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

Adding to 21432112124 its reverse (42121123412), we get a palindrome (63553235536).

The spelling of 21432112124 in words is "twenty-one billion, four hundred thirty-two million, one hundred twelve thousand, one hundred twenty-four".