22022021 has 12 divisors (see below), whose sum is σ = 27125388. Its totient is φ = 17764992.

The previous prime is 22022009. The next prime is 22022023. The reversal of 22022021 is 12022022.

It can be written as a sum of positive squares in 2 ways, for example, as 17757796 + 4264225 = 4214^2 + 2065^2 .

It is not a de Polignac number, because 22022021 - 2⁶ = 22021957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021993 and 22022011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22022023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12386 + ... + 14051.

It is an arithmetic number, because the mean of its divisors is an integer number (2260449).

Almost surely, 2^22022021 is an apocalyptic number.

It is an amenable number.

22022021 is a deficient number, since it is larger than the sum of its proper divisors (5103367).

22022021 is a wasteful number, since it uses less digits than its factorization.

22022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26468 (or 26461 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22022021 is about 4692.7626191829. The cubic root of 22022021 is about 280.2973923565.

Adding to 22022021 its reverse (12022022), we get a palindrome (34044043).

Subtracting from 22022021 its reverse (12022022), we obtain a palindrome (9999999).

The spelling of 22022021 in words is "twenty-two million, twenty-two thousand, twenty-one".