22001211220021 has 24 divisors (see below), whose sum is σ = 24216071052600. Its totient is φ = 19973880432000.

The previous prime is 22001211219971. The next prime is 22001211220061. The reversal of 22001211220021 is 12002211210022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4618265470225 + 17382945749796 = 2149015^2 + 4169286^2 .

It is not a de Polignac number, because 22001211220021 - 2²⁷ = 22001077002293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001211219977 and 22001211220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001211220061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 869566071 + ... + 869591371.

It is an arithmetic number, because the mean of its divisors is an integer number (1009002960525).

Almost surely, 2^{22001211220021} is an apocalyptic number.

It is an amenable number.

22001211220021 is a deficient number, since it is larger than the sum of its proper divisors (2214859832579).

22001211220021 is a wasteful number, since it uses less digits than its factorization.

22001211220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34821 (or 34810 counting only the distinct ones).

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

Adding to 22001211220021 its reverse (12002211210022), we get a palindrome (34003422430043).

Subtracting from 22001211220021 its reverse (12002211210022), we obtain a palindrome (9999000009999).

The spelling of 22001211220021 in words is "twenty-two trillion, one billion, two hundred eleven million, two hundred twenty thousand, twenty-one".