221033221020 has 72 divisors (see below), whose sum is σ = 681831324720. Its totient is φ = 57943169280.

The previous prime is 221033220997. The next prime is 221033221051. The reversal of 221033221020 is 20122330122.

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 = 221033220984 and 221033221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10395841 + ... + 10417080.

It is an arithmetic number, because the mean of its divisors is an integer number (9469879510).

Almost surely, 2^221033221020 is an apocalyptic number.

221033221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221033221020 is an abundant number, since it is smaller than the sum of its proper divisors (460798103700).

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

221033221020 is a wasteful number, since it uses less digits than its factorization.

221033221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20812995 (or 20812990 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 221033221020 its reverse (20122330122), we get a palindrome (241155551142).

The spelling of 221033221020 in words is "two hundred twenty-one billion, thirty-three million, two hundred twenty-one thousand, twenty".