21011320330 has 64 divisors (see below), whose sum is σ = 50779830528. Its totient is φ = 6045212160.

The previous prime is 21011320327. The next prime is 21011320333. The reversal of 21011320330 is 3302311012.

It is an interprime number because it is at equal distance from previous prime (21011320327) and next prime (21011320333).

It is not an unprimeable number, because it can be changed into a prime (21011320333) 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 31 ways as a sum of consecutive naturals, for example, 1039507 + ... + 1059526.

It is an arithmetic number, because the mean of its divisors is an integer number (793434852).

Almost surely, 2^21011320330 is an apocalyptic number.

21011320330 is an abundant number, since it is smaller than the sum of its proper divisors (29768510198).

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

21011320330 is a wasteful number, since it uses less digits than its factorization.

21011320330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099071.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21011320330 its reverse (3302311012), we get a palindrome (24313631342).

The spelling of 21011320330 in words is "twenty-one billion, eleven million, three hundred twenty thousand, three hundred thirty".