21423422234 has 16 divisors (see below), whose sum is σ = 32356558080. Its totient is φ = 10638133440.

The previous prime is 21423422233. The next prime is 21423422249. The reversal of 21423422234 is 43222432412.

It is a junction number, because it is equal to n+sod(n) for n = 21423422197 and 21423422206.

It is not an unprimeable number, because it can be changed into a prime (21423422233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129554 + ... + 244194.

It is an arithmetic number, because the mean of its divisors is an integer number (2022284880).

Almost surely, 2^21423422234 is an apocalyptic number.

21423422234 is a deficient number, since it is larger than the sum of its proper divisors (10933135846).

21423422234 is a wasteful number, since it uses less digits than its factorization.

21423422234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115285.

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

Adding to 21423422234 its reverse (43222432412), we get a palindrome (64645854646).

The spelling of 21423422234 in words is "twenty-one billion, four hundred twenty-three million, four hundred twenty-two thousand, two hundred thirty-four".