22011002021 has 4 divisors (see below), whose sum is σ = 22033532172. Its totient is φ = 21988471872.

The previous prime is 22011002017. The next prime is 22011002033. The reversal of 22011002021 is 12020011022.

It is a happy number.

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 21405153025 + 605848996 = 146305^2 + 24614^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011002021 - 2² = 22011002017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22011001993 and 22011002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011002051) 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, 11263610 + ... + 11265563.

It is an arithmetic number, because the mean of its divisors is an integer number (5508383043).

Almost surely, 2^22011002021 is an apocalyptic number.

It is an amenable number.

22011002021 is a deficient number, since it is larger than the sum of its proper divisors (22530151).

22011002021 is an equidigital number, since it uses as much as digits as its factorization.

22011002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22530150.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22011002021 its reverse (12020011022), we get a palindrome (34031013043).

Subtracting from 22011002021 its reverse (12020011022), we obtain a palindrome (9990990999).

The spelling of 22011002021 in words is "twenty-two billion, eleven million, two thousand, twenty-one".