21043434330 has 24 divisors (see below), whose sum is σ = 54712929492. Its totient is φ = 5611582464.

The previous prime is 21043434281. The next prime is 21043434337. The reversal of 21043434330 is 3343434012.

It can be written as a sum of positive squares in 2 ways, for example, as 21012531849 + 30902481 = 144957^2 + 5559^2 .

It is a super-2 number, since 2×21043434330² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21043434294 and 21043434303.

It is not an unprimeable number, because it can be changed into a prime (21043434337) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 116907879 + ... + 116908058.

Almost surely, 2^21043434330 is an apocalyptic number.

21043434330 is an abundant number, since it is smaller than the sum of its proper divisors (33669495162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21043434330 is a wasteful number, since it uses less digits than its factorization.

21043434330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233815950 (or 233815947 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21043434330 its reverse (3343434012), we get a palindrome (24386868342).

The spelling of 21043434330 in words is "twenty-one billion, forty-three million, four hundred thirty-four thousand, three hundred thirty".