21344422430 has 16 divisors (see below), whose sum is σ = 38435705280. Its totient is φ = 8534270112.

The previous prime is 21344422427. The next prime is 21344422439. The reversal of 21344422430 is 3422444312.

It is a junction number, because it is equal to n+sod(n) for n = 21344422393 and 21344422402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344422439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411665 + ... + 460604.

It is an arithmetic number, because the mean of its divisors is an integer number (2402231580).

Almost surely, 2^21344422430 is an apocalyptic number.

21344422430 is a deficient number, since it is larger than the sum of its proper divisors (17091282850).

21344422430 is a wasteful number, since it uses less digits than its factorization.

21344422430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874723.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21344422430 its reverse (3422444312), we get a palindrome (24766866742).

The spelling of 21344422430 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-two thousand, four hundred thirty".