21231434430 has 96 divisors (see below), whose sum is σ = 55495256544. Its totient is φ = 5631706368.

The previous prime is 21231434407. The next prime is 21231434431. The reversal of 21231434430 is 3443413212.

21231434430 is a `hidden beast` number, since 2 + 1 + 2 + 314 + 344 + 3 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21231434394 and 21231434403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231434431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24889884 + ... + 24890736.

It is an arithmetic number, because the mean of its divisors is an integer number (578075589).

Almost surely, 2^21231434430 is an apocalyptic number.

21231434430 is an abundant number, since it is smaller than the sum of its proper divisors (34263822114).

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

21231434430 is a wasteful number, since it uses less digits than its factorization.

21231434430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010 (or 2007 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21231434430 its reverse (3443413212), we get a palindrome (24674847642).

The spelling of 21231434430 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-four thousand, four hundred thirty".