22220222021 has 4 divisors (see below), whose sum is σ = 22220525292. Its totient is φ = 22219918752.

The previous prime is 22220222009. The next prime is 22220222023. The reversal of 22220222021 is 12022202222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3646348225 + 18573873796 = 60385^2 + 136286^2 .

It is a cyclic number.

It is not a de Polignac number, because 22220222021 - 2⁶ = 22220221957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220222023) 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, 34115 + ... + 213551.

It is an arithmetic number, because the mean of its divisors is an integer number (5555131323).

Almost surely, 2^22220222021 is an apocalyptic number.

It is an amenable number.

22220222021 is a deficient number, since it is larger than the sum of its proper divisors (303271).

22220222021 is a wasteful number, since it uses less digits than its factorization.

22220222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303270.

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

Adding to 22220222021 its reverse (12022202222), we get a palindrome (34242424243).

The spelling of 22220222021 in words is "twenty-two billion, two hundred twenty million, two hundred twenty-two thousand, twenty-one".