20222200021 has 4 divisors (see below), whose sum is σ = 20240635212. Its totient is φ = 20203764832.

The previous prime is 20222200013. The next prime is 20222200067. The reversal of 20222200021 is 12000222202.

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 7359237796 + 12862962225 = 85786^2 + 113415^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222200021 - 2³ = 20222200013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20222199974 and 20222200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222200091) 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, 9215950 + ... + 9218143.

It is an arithmetic number, because the mean of its divisors is an integer number (5060158803).

Almost surely, 2^20222200021 is an apocalyptic number.

It is an amenable number.

20222200021 is a deficient number, since it is larger than the sum of its proper divisors (18435191).

20222200021 is a wasteful number, since it uses less digits than its factorization.

20222200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18435190.

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

Adding to 20222200021 its reverse (12000222202), we get a palindrome (32222422223).

The spelling of 20222200021 in words is "twenty billion, two hundred twenty-two million, two hundred thousand, twenty-one".