21234304402 has 8 divisors (see below), whose sum is σ = 31881480012. Its totient is φ = 10607144400.

The previous prime is 21234304379. The next prime is 21234304423. The reversal of 21234304402 is 20440343212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19776515641 + 1457788761 = 140629^2 + 38181^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5001249 + ... + 5005492.

Almost surely, 2^21234304402 is an apocalyptic number.

21234304402 is a deficient number, since it is larger than the sum of its proper divisors (10647175610).

21234304402 is a wasteful number, since it uses less digits than its factorization.

21234304402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10007804.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21234304402 its reverse (20440343212), we get a palindrome (41674647614).

The spelling of 21234304402 in words is "twenty-one billion, two hundred thirty-four million, three hundred four thousand, four hundred two".