21134121432 has 96 divisors (see below), whose sum is σ = 55650628800. Its totient is φ = 6686124928.

The previous prime is 21134121397. The next prime is 21134121451. The reversal of 21134121432 is 23412143112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1181983 + ... + 1199729.

It is an arithmetic number, because the mean of its divisors is an integer number (579694050).

Almost surely, 2^21134121432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21134121432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27825314400).

21134121432 is an abundant number, since it is smaller than the sum of its proper divisors (34516507368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21134121432 is a wasteful number, since it uses less digits than its factorization.

21134121432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17873 (or 17840 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

Adding to 21134121432 its reverse (23412143112), we get a palindrome (44546264544).

The spelling of 21134121432 in words is "twenty-one billion, one hundred thirty-four million, one hundred twenty-one thousand, four hundred thirty-two".