221222020020 has 96 divisors (see below), whose sum is σ = 634811240448. Its totient is φ = 57531126912.

The previous prime is 221222020003. The next prime is 221222020021. The reversal of 221222020020 is 20020222122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222020021) 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, 1602997 + ... + 1735523.

It is an arithmetic number, because the mean of its divisors is an integer number (6612617088).

Almost surely, 2^221222020020 is an apocalyptic number.

221222020020 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 221222020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317405620224).

221222020020 is an abundant number, since it is smaller than the sum of its proper divisors (413589220428).

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

221222020020 is a wasteful number, since it uses less digits than its factorization.

221222020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133229 (or 133227 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 221222020020 its reverse (20020222122), we get a palindrome (241242242142).

The spelling of 221222020020 in words is "two hundred twenty-one billion, two hundred twenty-two million, twenty thousand, twenty".