201122021 has 2 divisors, whose sum is σ = 201122022. Its totient is φ = 201122020.

The previous prime is 201121993. The next prime is 201122027. The reversal of 201122021 is 120221102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157377025 + 43744996 = 12545^2 + 6614^2 .

It is a cyclic number.

It is not a de Polignac number, because 201122021 - 2⁶ = 201121957 is a prime.

It is a super-2 number, since 2×201122021² = 80900134662248882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 201121993 and 201122011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201122027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100561010 + 100561011.

It is an arithmetic number, because the mean of its divisors is an integer number (100561011).

Almost surely, 2^201122021 is an apocalyptic number.

It is an amenable number.

201122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201122021 is an equidigital number, since it uses as much as digits as its factorization.

201122021 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 201122021 is about 14181.7495747175. The cubic root of 201122021 is about 585.8951120189.

Adding to 201122021 its reverse (120221102), we get a palindrome (321343123).

The spelling of 201122021 in words is "two hundred one million, one hundred twenty-two thousand, twenty-one".