221120212100020 has 24 divisors (see below), whose sum is σ = 464355484584264. Its totient is φ = 88447505949696.

The previous prime is 221120212100009. The next prime is 221120212100089. The reversal of 221120212100020 is 20001212021122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32346132017956 + 188774080082064 = 5687366^2 + 13739508^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221120212099967 and 221120212100003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33041829 + ... + 39166348.

It is an arithmetic number, because the mean of its divisors is an integer number (19348145191011).

Almost surely, 2^{221120212100020} is an apocalyptic number.

221120212100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221120212100020 is an abundant number, since it is smaller than the sum of its proper divisors (243235272484244).

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

221120212100020 is a wasteful number, since it uses less digits than its factorization.

221120212100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72361299 (or 72361297 counting only the distinct ones).

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

Adding to 221120212100020 its reverse (20001212021122), we get a palindrome (241121424121142).

The spelling of 221120212100020 in words is "two hundred twenty-one trillion, one hundred twenty billion, two hundred twelve million, one hundred thousand, twenty".