21220221120120 has 192 divisors, whose sum is σ = 78021823501440. Its totient is φ = 5144296003200.

The previous prime is 21220221120101. The next prime is 21220221120169. The reversal of 21220221120120 is 2102112202212.

It is a happy number.

21220221120120 is a `hidden beast` number, since 2 + 1 + 220 + 221 + 1 + 201 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21220221120093 and 21220221120102.

It is a congruent number.

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, 99127186 + ... + 99341025.

It is an arithmetic number, because the mean of its divisors is an integer number (406363664070).

Almost surely, 2^{21220221120120} is an apocalyptic number.

21220221120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220221120120 is an abundant number, since it is smaller than the sum of its proper divisors (56801602381320).

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

21220221120120 is a wasteful number, since it uses less digits than its factorization.

21220221120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198468248 (or 198468232 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21220221120120 its reverse (2102112202212), we get a palindrome (23322333322332).

The spelling of 21220221120120 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty".