21120321330 has 48 divisors (see below), whose sum is σ = 55241694144. Its totient is φ = 5598356640.

The previous prime is 21120321329. The next prime is 21120321371. The reversal of 21120321330 is 3312302112.

21120321330 is a `hidden beast` number, since 2 + 1 + 12 + 0 + 321 + 330 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 687576 + ... + 717635.

It is an arithmetic number, because the mean of its divisors is an integer number (1150868628).

Almost surely, 2^21120321330 is an apocalyptic number.

21120321330 is an abundant number, since it is smaller than the sum of its proper divisors (34121372814).

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

21120321330 is a wasteful number, since it uses less digits than its factorization.

21120321330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405391 (or 1405388 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21120321330 its reverse (3312302112), we get a palindrome (24432623442).

The spelling of 21120321330 in words is "twenty-one billion, one hundred twenty million, three hundred twenty-one thousand, three hundred thirty".