221121110021020 has 48 divisors (see below), whose sum is σ = 508799939937408. Its totient is φ = 80053457514560.

The previous prime is 221121110020999. The next prime is 221121110021027. The reversal of 221121110021020 is 20120011121122.

221121110021020 is digitally balanced in base 2, 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 = 221121110020985 and 221121110021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121110021027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2213817802 + ... + 2213917681.

It is an arithmetic number, because the mean of its divisors is an integer number (10599998748696).

Almost surely, 2^{221121110021020} is an apocalyptic number.

221121110021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121110021020 is an abundant number, since it is smaller than the sum of its proper divisors (287678829916388).

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

221121110021020 is a wasteful number, since it uses less digits than its factorization.

221121110021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427735730 (or 4427735728 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221121110021020 its reverse (20120011121122), we get a palindrome (241241121142142).

The spelling of 221121110021020 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred ten million, twenty-one thousand, twenty".