22220200021 has 4 divisors (see below), whose sum is σ = 22639449132. Its totient is φ = 21800950912.

The previous prime is 22220199983. The next prime is 22220200033. The reversal of 22220200021 is 12000202222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14609556900 + 7610643121 = 120870^2 + 87239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22220200021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22220199974 and 22220200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220200061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209624476 + ... + 209624581.

It is an arithmetic number, because the mean of its divisors is an integer number (5659862283).

Almost surely, 2^22220200021 is an apocalyptic number.

It is an amenable number.

22220200021 is a deficient number, since it is larger than the sum of its proper divisors (419249111).

22220200021 is an equidigital number, since it uses as much as digits as its factorization.

22220200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419249110.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 22220200021 its reverse (12000202222), we get a palindrome (34220402243).

The spelling of 22220200021 in words is "twenty-two billion, two hundred twenty million, two hundred thousand, twenty-one".