21204214430 has 24 divisors (see below), whose sum is σ = 44399029608. Its totient is φ = 7270016208.

The previous prime is 21204214391. The next prime is 21204214433. The reversal of 21204214430 is 3441240212.

It is a junction number, because it is equal to n+sod(n) for n = 21204214396 and 21204214405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204214433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21636464 + ... + 21637443.

It is an arithmetic number, because the mean of its divisors is an integer number (1849959567).

Almost surely, 2^21204214430 is an apocalyptic number.

21204214430 is an abundant number, since it is smaller than the sum of its proper divisors (23194815178).

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

21204214430 is a wasteful number, since it uses less digits than its factorization.

21204214430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43273928 (or 43273921 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21204214430 its reverse (3441240212), we get a palindrome (24645454642).

The spelling of 21204214430 in words is "twenty-one billion, two hundred four million, two hundred fourteen thousand, four hundred thirty".