21222232320 has 72 divisors (see below), whose sum is σ = 67778516736. Its totient is φ = 5659260928.

The previous prime is 21222232313. The next prime is 21222232349. The reversal of 21222232320 is 2323222212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2759472 + ... + 2767151.

It is an arithmetic number, because the mean of its divisors is an integer number (941368288).

Almost surely, 2^21222232320 is an apocalyptic number.

21222232320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222232320 is an abundant number, since it is smaller than the sum of its proper divisors (46556284416).

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

21222232320 is an equidigital number, since it uses as much as digits as its factorization.

21222232320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5526647 (or 5526633 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21222232320 its reverse (2323222212), we get a palindrome (23545454532).

The spelling of 21222232320 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-two thousand, three hundred twenty".