21223213120 has 28 divisors (see below), whose sum is σ = 50537777004. Its totient is φ = 8489285120.

The previous prime is 21223213097. The next prime is 21223213127. The reversal of 21223213120 is 2131232212.

It can be written as a sum of positive squares in 2 ways, for example, as 15767322624 + 5455890496 = 125568^2 + 73864^2 .

It is not an unprimeable number, because it can be changed into a prime (21223213127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33160951 + ... + 33161590.

Almost surely, 2^21223213120 is an apocalyptic number.

21223213120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223213120 is an abundant number, since it is smaller than the sum of its proper divisors (29314563884).

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

21223213120 is an equidigital number, since it uses as much as digits as its factorization.

21223213120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66322558 (or 66322548 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21223213120 its reverse (2131232212), we get a palindrome (23354445332).

The spelling of 21223213120 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirteen thousand, one hundred twenty".