21433344434 has 8 divisors (see below), whose sum is σ = 32590428060. Its totient is φ = 10569868416.

The previous prime is 21433344419. The next prime is 21433344437. The reversal of 21433344434 is 43444333412.

It can be written as a sum of positive squares in 2 ways, for example, as 21241605025 + 191739409 = 145745^2 + 13847^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21433344394 and 21433344403.

It is not an unprimeable number, because it can be changed into a prime (21433344437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73401719 + ... + 73402010.

Almost surely, 2^21433344434 is an apocalyptic number.

21433344434 is a deficient number, since it is larger than the sum of its proper divisors (11157083626).

21433344434 is a wasteful number, since it uses less digits than its factorization.

21433344434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146803804.

The product of its digits is 165888, while the sum is 35.

Adding to 21433344434 its reverse (43444333412), we get a palindrome (64877677846).

The spelling of 21433344434 in words is "twenty-one billion, four hundred thirty-three million, three hundred forty-four thousand, four hundred thirty-four".