22211221021 has 16 divisors (see below), whose sum is σ = 25661033280. Its totient is φ = 19000334080.

The previous prime is 22211220947. The next prime is 22211221033. The reversal of 22211221021 is 12012211222.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 22211221021 - 2¹⁵ = 22211188253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22211220986 and 22211221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211221061) 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, 1236315 + ... + 1254151.

It is an arithmetic number, because the mean of its divisors is an integer number (1603814580).

Almost surely, 2^22211221021 is an apocalyptic number.

It is an amenable number.

22211221021 is a deficient number, since it is larger than the sum of its proper divisors (3449812259).

22211221021 is a wasteful number, since it uses less digits than its factorization.

22211221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24524.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22211221021 its reverse (12012211222), we get a palindrome (34223432243).

The spelling of 22211221021 in words is "twenty-two billion, two hundred eleven million, two hundred twenty-one thousand, twenty-one".