20222021 has 2 divisors, whose sum is σ = 20222022. Its totient is φ = 20222020.

The previous prime is 20222011. The next prime is 20222047. The reversal of 20222021 is 12022202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11730625 + 8491396 = 3425^2 + 2914^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222021 - 2²² = 16027717 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221993 and 20222011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20222011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111010 + 10111011.

It is an arithmetic number, because the mean of its divisors is an integer number (10111011).

Almost surely, 2^20222021 is an apocalyptic number.

It is an amenable number.

20222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222021 is an equidigital number, since it uses as much as digits as its factorization.

20222021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20222021 is about 4496.8901476465. The cubic root of 20222021 is about 272.4424971953.

Adding to 20222021 its reverse (12022202), we get a palindrome (32244223).

The spelling of 20222021 in words is "twenty million, two hundred twenty-two thousand, twenty-one".