21120100221220 has 144 divisors (see below), whose sum is σ = 60000956676864. Its totient is φ = 6076512288000.

The previous prime is 21120100221203. The next prime is 21120100221257. The reversal of 21120100221220 is 2212200102112.

It is a happy number.

21120100221220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21120100221194 and 21120100221203.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47732056 + ... + 48172495.

It is an arithmetic number, because the mean of its divisors is an integer number (416673310256).

Almost surely, 2^{21120100221220} is an apocalyptic number.

21120100221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120100221220 is an abundant number, since it is smaller than the sum of its proper divisors (38880856455644).

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

21120100221220 is a wasteful number, since it uses less digits than its factorization.

21120100221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95904602 (or 95904589 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120100221220 its reverse (2212200102112), we get a palindrome (23332300323332).

The spelling of 21120100221220 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, two hundred twenty-one thousand, two hundred twenty".