21120220330 has 64 divisors (see below), whose sum is σ = 43721441280. Its totient is φ = 7274145600.

The previous prime is 21120220307. The next prime is 21120220339. The reversal of 21120220330 is 3302202112.

It is not an unprimeable number, because it can be changed into a prime (21120220339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94381 + ... + 226159.

It is an arithmetic number, because the mean of its divisors is an integer number (683147520).

Almost surely, 2^21120220330 is an apocalyptic number.

21120220330 is an abundant number, since it is smaller than the sum of its proper divisors (22601220950).

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

21120220330 is a wasteful number, since it uses less digits than its factorization.

21120220330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131875.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21120220330 its reverse (3302202112), we get a palindrome (24422422442).

The spelling of 21120220330 in words is "twenty-one billion, one hundred twenty million, two hundred twenty thousand, three hundred thirty".