22020222221 has 4 divisors (see below), whose sum is σ = 22021897500. Its totient is φ = 22018546944.

The previous prime is 22020222163. The next prime is 22020222233. The reversal of 22020222221 is 12222202022.

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 1706846596 + 20313375625 = 41314^2 + 142525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22020222221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22020222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22020222251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817766 + ... + 844263.

It is an arithmetic number, because the mean of its divisors is an integer number (5505474375).

Almost surely, 2^22020222221 is an apocalyptic number.

It is an amenable number.

22020222221 is a deficient number, since it is larger than the sum of its proper divisors (1675279).

22020222221 is a wasteful number, since it uses less digits than its factorization.

22020222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675278.

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

Adding to 22020222221 its reverse (12222202022), we get a palindrome (34242424243).

The spelling of 22020222221 in words is "twenty-two billion, twenty million, two hundred twenty-two thousand, two hundred twenty-one".