21240302330 has 32 divisors (see below), whose sum is σ = 41210651664. Its totient is φ = 7835498496.

The previous prime is 21240302327. The next prime is 21240302381. The reversal of 21240302330 is 3320304212.

It can be written as a sum of positive squares in 8 ways, for example, as 125596849 + 21114705481 = 11207^2 + 145309^2 .

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 15 ways as a sum of consecutive naturals, for example, 72074 + ... + 218346.

Almost surely, 2^21240302330 is an apocalyptic number.

21240302330 is a deficient number, since it is larger than the sum of its proper divisors (19970349334).

21240302330 is a wasteful number, since it uses less digits than its factorization.

21240302330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147410.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21240302330 its reverse (3320304212), we get a palindrome (24560606542).

The spelling of 21240302330 in words is "twenty-one billion, two hundred forty million, three hundred two thousand, three hundred thirty".