211021222210021 has 2 divisors, whose sum is σ = 211021222210022. Its totient is φ = 211021222210020.

The previous prime is 211021222209997. The next prime is 211021222210063. The reversal of 211021222210021 is 120012222120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207654988037121 + 3366234172900 = 14410239^2 + 1834730^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021222210021 - 2⁵ = 211021222209989 is a prime.

It is a super-2 number, since 2×211021222210021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211021222217021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510611105010 + 105510611105011.

It is an arithmetic number, because the mean of its divisors is an integer number (105510611105011).

Almost surely, 2^{211021222210021} is an apocalyptic number.

It is an amenable number.

211021222210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021222210021 is an equidigital number, since it uses as much as digits as its factorization.

211021222210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211021222210021 its reverse (120012222120112), we get a palindrome (331033444330133).

The spelling of 211021222210021 in words is "two hundred eleven trillion, twenty-one billion, two hundred twenty-two million, two hundred ten thousand, twenty-one".