211322021 has 2 divisors, whose sum is σ = 211322022. Its totient is φ = 211322020.

The previous prime is 211322017. The next prime is 211322051. The reversal of 211322021 is 120223112.

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., 172396900 + 38925121 = 13130^2 + 6239^2 .

It is a cyclic number.

It is not a de Polignac number, because 211322021 - 2² = 211322017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211321987 and 211322005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211322051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105661010 + 105661011.

It is an arithmetic number, because the mean of its divisors is an integer number (105661011).

Almost surely, 2^211322021 is an apocalyptic number.

It is an amenable number.

211322021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211322021 is an equidigital number, since it uses as much as digits as its factorization.

211322021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 211322021 is about 14536.9192403342. The cubic root of 211322021 is about 595.6368869440.

Adding to 211322021 its reverse (120223112), we get a palindrome (331545133).

The spelling of 211322021 in words is "two hundred eleven million, three hundred twenty-two thousand, twenty-one".