221202222020 has 24 divisors (see below), whose sum is σ = 500257333464. Its totient is φ = 81674666496.

The previous prime is 221202221969. The next prime is 221202222023. The reversal of 221202222020 is 20222202122.

It can be written as a sum of positive squares in 4 ways, for example, as 8844676 + 221193377344 = 2974^2 + 470312^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221202222020.

It is not an unprimeable number, because it can be changed into a prime (221202222023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425388629 + ... + 425389148.

It is an arithmetic number, because the mean of its divisors is an integer number (20844055561).

Almost surely, 2^221202222020 is an apocalyptic number.

221202222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221202222020 is an abundant number, since it is smaller than the sum of its proper divisors (279055111444).

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

221202222020 is a wasteful number, since it uses less digits than its factorization.

221202222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850777799 (or 850777797 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 221202222020 its reverse (20222202122), we get a palindrome (241424424142).

The spelling of 221202222020 in words is "two hundred twenty-one billion, two hundred two million, two hundred twenty-two thousand, twenty".