12122021 has 2 divisors, whose sum is σ = 12122022. Its totient is φ = 12122020.

The previous prime is 12122009. The next prime is 12122039. The reversal of 12122021 is 12022121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8473921 + 3648100 = 2911^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122021 - 2⁶ = 12121957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12121993 and 12122011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12122041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061010 + 6061011.

It is an arithmetic number, because the mean of its divisors is an integer number (6061011).

Almost surely, 2^12122021 is an apocalyptic number.

It is an amenable number.

12122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122021 is an equidigital number, since it uses as much as digits as its factorization.

12122021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 12122021 is about 3481.6692835478. The cubic root of 12122021 is about 229.7162284797.

Adding to 12122021 its reverse (12022121), we get a palindrome (24144142).

The spelling of 12122021 in words is "twelve million, one hundred twenty-two thousand, twenty-one".