221100020020 has 24 divisors (see below), whose sum is σ = 506520046368. Its totient is φ = 80400007200.

The previous prime is 221100020017. The next prime is 221100020047. The reversal of 221100020020 is 20020001122.

221100020020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 221100019979 and 221100020006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502499826 + ... + 502500265.

It is an arithmetic number, because the mean of its divisors is an integer number (21105001932).

Almost surely, 2^221100020020 is an apocalyptic number.

221100020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221100020020 is an abundant number, since it is smaller than the sum of its proper divisors (285420026348).

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

221100020020 is a wasteful number, since it uses less digits than its factorization.

221100020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005000111 (or 1005000109 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 221100020020 its reverse (20020001122), we get a palindrome (241120021142).

The spelling of 221100020020 in words is "two hundred twenty-one billion, one hundred million, twenty thousand, twenty".