22022221021 has 2 divisors, whose sum is σ = 22022221022. Its totient is φ = 22022221020.

The previous prime is 22022221019. The next prime is 22022221139. The reversal of 22022221021 is 12012222022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21487455396 + 534765625 = 146586^2 + 23125^2 .

It is a cyclic number.

It is not a de Polignac number, because 22022221021 - 2¹ = 22022221019 is a prime.

Together with 22022221019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22022220986 and 22022221004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22022221721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11011110510 + 11011110511.

It is an arithmetic number, because the mean of its divisors is an integer number (11011110511).

Almost surely, 2^22022221021 is an apocalyptic number.

It is an amenable number.

22022221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22022221021 is an equidigital number, since it uses as much as digits as its factorization.

22022221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22022221021 its reverse (12012222022), we get a palindrome (34034443043).

The spelling of 22022221021 in words is "twenty-two billion, twenty-two million, two hundred twenty-one thousand, twenty-one".