22220000021 has 4 divisors (see below), whose sum is σ = 22223318700. Its totient is φ = 22216681344.

The previous prime is 22219999993. The next prime is 22220000029. The reversal of 22220000021 is 12000002222.

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 15801747025 + 6418252996 = 125705^2 + 80114^2 .

It is a cyclic number.

It is not a de Polignac number, because 22220000021 - 2¹⁸ = 22219737877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22219999957 and 22220000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220000029) 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, 1649276 + ... + 1662693.

It is an arithmetic number, because the mean of its divisors is an integer number (5555829675).

Almost surely, 2^22220000021 is an apocalyptic number.

It is an amenable number.

22220000021 is a deficient number, since it is larger than the sum of its proper divisors (3318679).

22220000021 is an equidigital number, since it uses as much as digits as its factorization.

22220000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318678.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 22220000021 its reverse (12000002222), we get a palindrome (34220002243).

The spelling of 22220000021 in words is "twenty-two billion, two hundred twenty million, twenty-one", and thus it is an aban number.