221220120020 has 24 divisors (see below), whose sum is σ = 465115996800. Its totient is φ = 88382572832.

The previous prime is 221220120013. The next prime is 221220120041. The reversal of 221220120020 is 20021022122.

It is a junction number, because it is equal to n+sod(n) for n = 221220119977 and 221220120004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6575000 + ... + 6608559.

It is an arithmetic number, because the mean of its divisors is an integer number (19379833200).

Almost surely, 2^221220120020 is an apocalyptic number.

221220120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220120020 is an abundant number, since it is smaller than the sum of its proper divisors (243895876780).

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

221220120020 is a wasteful number, since it uses less digits than its factorization.

221220120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13184407 (or 13184405 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221220120020 its reverse (20021022122), we get a palindrome (241241142142).

The spelling of 221220120020 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, twenty".