21120213320 has 16 divisors (see below), whose sum is σ = 47520480060. Its totient is φ = 8448085312.

The previous prime is 21120213319. The next prime is 21120213341. The reversal of 21120213320 is 2331202112.

It can be written as a sum of positive squares in 2 ways, for example, as 20060189956 + 1060023364 = 141634^2 + 32558^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 264002627 + ... + 264002706.

Almost surely, 2^21120213320 is an apocalyptic number.

21120213320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120213320 is an abundant number, since it is smaller than the sum of its proper divisors (26400266740).

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

21120213320 is a wasteful number, since it uses less digits than its factorization.

21120213320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528005344 (or 528005340 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21120213320 its reverse (2331202112), we get a palindrome (23451415432).

The spelling of 21120213320 in words is "twenty-one billion, one hundred twenty million, two hundred thirteen thousand, three hundred twenty".