21120120122220 has 144 divisors (see below), whose sum is σ = 73941331883328. Its totient is φ = 4779659404800.

The previous prime is 21120120122201. The next prime is 21120120122237. The reversal of 21120120122220 is 2222102102112.

It is a happy number.

21120120122220 is a `hidden beast` number, since 21 + 1 + 201 + 201 + 22 + 220 = 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 = 21120120122193 and 21120120122202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82852939 + ... + 83107458.

It is an arithmetic number, because the mean of its divisors is an integer number (513481471412).

Almost surely, 2^{21120120122220} is an apocalyptic number.

21120120122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120120122220 is an abundant number, since it is smaller than the sum of its proper divisors (52821211761108).

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

21120120122220 is a wasteful number, since it uses less digits than its factorization.

21120120122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165960520 (or 165960515 counting only the distinct ones).

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

Adding to 21120120122220 its reverse (2222102102112), we get a palindrome (23342222224332).

The spelling of 21120120122220 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty million, one hundred twenty-two thousand, two hundred twenty".