21343304434 has 16 divisors (see below), whose sum is σ = 33611873472. Its totient is φ = 10145040048.

The previous prime is 21343304413. The next prime is 21343304453. The reversal of 21343304434 is 43440334312.

It is a junction number, because it is equal to n+sod(n) for n = 21343304396 and 21343304405.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1415769 + ... + 1430764.

It is an arithmetic number, because the mean of its divisors is an integer number (2100742092).

Almost surely, 2^21343304434 is an apocalyptic number.

21343304434 is a deficient number, since it is larger than the sum of its proper divisors (12268569038).

21343304434 is a wasteful number, since it uses less digits than its factorization.

21343304434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846721.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 21343304434 its reverse (43440334312), we get a palindrome (64783638746).

The spelling of 21343304434 in words is "twenty-one billion, three hundred forty-three million, three hundred four thousand, four hundred thirty-four".