221033609020 has 72 divisors (see below), whose sum is σ = 557371463040. Its totient is φ = 73338330240.

The previous prime is 221033608973. The next prime is 221033609021. The reversal of 221033609020 is 20906330122.

221033609020 is digitally balanced in base 3, 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 (28).

It is a self number, because there is not a number n which added to its sum of digits gives 221033609020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221033609021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3607435 + ... + 3668194.

It is an arithmetic number, because the mean of its divisors is an integer number (7741270320).

Almost surely, 2^221033609020 is an apocalyptic number.

221033609020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221033609020 is an abundant number, since it is smaller than the sum of its proper divisors (336337854020).

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

221033609020 is a wasteful number, since it uses less digits than its factorization.

221033609020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7275683 (or 7275674 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 221033609020 its reverse (20906330122), we get a palindrome (241939939142).

The spelling of 221033609020 in words is "two hundred twenty-one billion, thirty-three million, six hundred nine thousand, twenty".