21444452434 has 16 divisors (see below), whose sum is σ = 32210485272. Its totient is φ = 10707637248.

The previous prime is 21444452389. The next prime is 21444452437. The reversal of 21444452434 is 43425444412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15998455225 + 5445997209 = 126485^2 + 73797^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21444452393 and 21444452402.

It is not an unprimeable number, because it can be changed into a prime (21444452437) 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, 9350992 + ... + 9353284.

Almost surely, 2^21444452434 is an apocalyptic number.

21444452434 is a deficient number, since it is larger than the sum of its proper divisors (10766032838).

21444452434 is a wasteful number, since it uses less digits than its factorization.

21444452434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6621.

The product of its digits is 245760, while the sum is 37.

Adding to 21444452434 its reverse (43425444412), we get a palindrome (64869896846).

The spelling of 21444452434 in words is "twenty-one billion, four hundred forty-four million, four hundred fifty-two thousand, four hundred thirty-four".