21043324630 has 16 divisors (see below), whose sum is σ = 37887232320. Its totient is φ = 8415274752.

The previous prime is 21043324571. The next prime is 21043324639. The reversal of 21043324630 is 3642334012.

It is a super-2 number, since 2×21043324630² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043324639) 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 7 ways as a sum of consecutive naturals, for example, 213534 + ... + 296113.

It is an arithmetic number, because the mean of its divisors is an integer number (2367952020).

Almost surely, 2^21043324630 is an apocalyptic number.

21043324630 is a deficient number, since it is larger than the sum of its proper divisors (16843907690).

21043324630 is a wasteful number, since it uses less digits than its factorization.

21043324630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513783.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21043324630 its reverse (3642334012), we get a palindrome (24685658642).

The spelling of 21043324630 in words is "twenty-one billion, forty-three million, three hundred twenty-four thousand, six hundred thirty".