22022122021 has 4 divisors (see below), whose sum is σ = 22100492844. Its totient is φ = 21943751200.

The previous prime is 22022121983. The next prime is 22022122049. The reversal of 22022122021 is 12022122022.

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 8120532996 + 13901589025 = 90114^2 + 117905^2 .

It is a cyclic number.

It is not a de Polignac number, because 22022122021 - 2⁹ = 22022121509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22022121986 and 22022122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22022122621) 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, 39184990 + ... + 39185551.

It is an arithmetic number, because the mean of its divisors is an integer number (5525123211).

Almost surely, 2^22022122021 is an apocalyptic number.

It is an amenable number.

22022122021 is a deficient number, since it is larger than the sum of its proper divisors (78370823).

22022122021 is an equidigital number, since it uses as much as digits as its factorization.

22022122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78370822.

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

Adding to 22022122021 its reverse (12022122022), we get a palindrome (34044244043).

Subtracting from 22022122021 its reverse (12022122022), we obtain a palindrome (9999999999).

It can be divided in two parts, 220221 and 22021, that added together give a palindrome (242242).

The spelling of 22022122021 in words is "twenty-two billion, twenty-two million, one hundred twenty-two thousand, twenty-one".