22102202021 has 4 divisors (see below), whose sum is σ = 22104593772. Its totient is φ = 22099810272.

The previous prime is 22102201997. The next prime is 22102202047. The reversal of 22102202021 is 12020220122.

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 17007811396 + 5094390625 = 130414^2 + 71375^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102202021 - 2¹⁰ = 22102200997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22102201987 and 22102202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102202321) 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, 1181960 + ... + 1200513.

It is an arithmetic number, because the mean of its divisors is an integer number (5526148443).

Almost surely, 2^22102202021 is an apocalyptic number.

It is an amenable number.

22102202021 is a deficient number, since it is larger than the sum of its proper divisors (2391751).

22102202021 is an equidigital number, since it uses as much as digits as its factorization.

22102202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391750.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 22102202021 its reverse (12020220122), we get a palindrome (34122422143).

The spelling of 22102202021 in words is "twenty-two billion, one hundred two million, two hundred two thousand, twenty-one".