22221000021 has 16 divisors (see below), whose sum is σ = 32869278720. Its totient is φ = 13239012720.

The previous prime is 22221000019. The next prime is 22221000031. The reversal of 22221000021 is 12000012222.

It is not a de Polignac number, because 22221000021 - 2¹ = 22221000019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22220999970 and 22221000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221000031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5704525 + ... + 5708418.

It is an arithmetic number, because the mean of its divisors is an integer number (2054329920).

Almost surely, 2^22221000021 is an apocalyptic number.

It is an amenable number.

22221000021 is a deficient number, since it is larger than the sum of its proper divisors (10648278699).

22221000021 is a wasteful number, since it uses less digits than its factorization.

22221000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11413016.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22221000021 its reverse (12000012222), we get a palindrome (34221012243).

The spelling of 22221000021 in words is "twenty-two billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.