21432121321132 has 12 divisors (see below), whose sum is σ = 37559112475360. Its totient is φ = 10700946328176.

The previous prime is 21432121321111. The next prime is 21432121321133. The reversal of 21432121321132 is 23112312123412.

It is a happy number.

It is a super-2 number, since 2×21432121321132² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21432121321132.

It is not an unprimeable number, because it can be changed into a prime (21432121321133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3778579908 + ... + 3778585579.

Almost surely, 2^{21432121321132} is an apocalyptic number.

It is an amenable number.

21432121321132 is a deficient number, since it is larger than the sum of its proper divisors (16126991154228).

21432121321132 is a wasteful number, since it uses less digits than its factorization.

21432121321132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7557166200 (or 7557166198 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

Adding to 21432121321132 its reverse (23112312123412), we get a palindrome (44544433444544).

The spelling of 21432121321132 in words is "twenty-one trillion, four hundred thirty-two billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred thirty-two".