21113430324 has 48 divisors (see below), whose sum is σ = 57824178048. Its totient is φ = 5869369728.

The previous prime is 21113430323. The next prime is 21113430413. The reversal of 21113430324 is 42303431112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21113430294 and 21113430303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113430323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3393519 + ... + 3399734.

It is an arithmetic number, because the mean of its divisors is an integer number (1204670376).

Almost surely, 2^21113430324 is an apocalyptic number.

It is an amenable number.

21113430324 is an abundant number, since it is smaller than the sum of its proper divisors (36710747724).

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

21113430324 is a wasteful number, since it uses less digits than its factorization.

21113430324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6793304 (or 6793302 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21113430324 its reverse (42303431112), we get a palindrome (63416861436).

The spelling of 21113430324 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty thousand, three hundred twenty-four".