21312302330 has 24 divisors (see below), whose sum is σ = 42166656756. Its totient is φ = 7749927680.

The previous prime is 21312302303. The next prime is 21312302351. The reversal of 21312302330 is 3320321312.

It can be written as a sum of positive squares in 2 ways, for example, as 21182182681 + 130119649 = 145541^2 + 11407^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8805527 + ... + 8807946.

Almost surely, 2^21312302330 is an apocalyptic number.

21312302330 is a deficient number, since it is larger than the sum of its proper divisors (20854354426).

21312302330 is a wasteful number, since it uses less digits than its factorization.

21312302330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17613502 (or 17613491 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21312302330 its reverse (3320321312), we get a palindrome (24632623642).

The spelling of 21312302330 in words is "twenty-one billion, three hundred twelve million, three hundred two thousand, three hundred thirty".