210001221211 has 2 divisors, whose sum is σ = 210001221212. Its totient is φ = 210001221210.

The previous prime is 210001221203. The next prime is 210001221223. The reversal of 210001221211 is 112122100012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210001221211 - 2³ = 210001221203 is a prime.

It is a super-2 number, since 2×210001221211² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210001221191 and 210001221200.

It is not a weakly prime, because it can be changed into another prime (210001221251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000610605 + 105000610606.

It is an arithmetic number, because the mean of its divisors is an integer number (105000610606).

Almost surely, 2^210001221211 is an apocalyptic number.

210001221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001221211 is an equidigital number, since it uses as much as digits as its factorization.

210001221211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210001221211 its reverse (112122100012), we get a palindrome (322123321223).

The spelling of 210001221211 in words is "two hundred ten billion, one million, two hundred twenty-one thousand, two hundred eleven".