221404223020 has 96 divisors (see below), whose sum is σ = 488285521920. Its totient is φ = 84218265600.

The previous prime is 221404223009. The next prime is 221404223023. The reversal of 221404223020 is 20322404122.

It is a junction number, because it is equal to n+sod(n) for n = 221404222982 and 221404223000.

It is not an unprimeable number, because it can be changed into a prime (221404223023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11296149 + ... + 11315731.

It is an arithmetic number, because the mean of its divisors is an integer number (5086307520).

Almost surely, 2^221404223020 is an apocalyptic number.

221404223020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221404223020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244142760960).

221404223020 is an abundant number, since it is smaller than the sum of its proper divisors (266881298900).

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

221404223020 is a wasteful number, since it uses less digits than its factorization.

221404223020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19915 (or 19913 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 221404223020 its reverse (20322404122), we get a palindrome (241726627142).

The spelling of 221404223020 in words is "two hundred twenty-one billion, four hundred four million, two hundred twenty-three thousand, twenty".