21431112330 has 64 divisors (see below), whose sum is σ = 52434345600. Its totient is φ = 5604009216.

The previous prime is 21431112251. The next prime is 21431112343. The reversal of 21431112330 is 3321113412.

It is a junction number, because it is equal to n+sod(n) for n = 21431112297 and 21431112306.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4708896 + ... + 4713444.

It is an arithmetic number, because the mean of its divisors is an integer number (819286650).

Almost surely, 2^21431112330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21431112330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26217172800).

21431112330 is an abundant number, since it is smaller than the sum of its proper divisors (31003233270).

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

21431112330 is a wasteful number, since it uses less digits than its factorization.

21431112330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7575.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21431112330 its reverse (3321113412), we get a palindrome (24752225742).

The spelling of 21431112330 in words is "twenty-one billion, four hundred thirty-one million, one hundred twelve thousand, three hundred thirty".