221213212211 has 2 divisors, whose sum is σ = 221213212212. Its totient is φ = 221213212210.

The previous prime is 221213212193. The next prime is 221213212247. The reversal of 221213212211 is 112212312122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221213212211 - 2¹⁸ = 221212950067 is a prime.

It is not a weakly prime, because it can be changed into another prime (221213212291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606606105 + 110606606106.

It is an arithmetic number, because the mean of its divisors is an integer number (110606606106).

Almost surely, 2^221213212211 is an apocalyptic number.

221213212211 is a deficient number, since it is larger than the sum of its proper divisors (1).

221213212211 is an equidigital number, since it uses as much as digits as its factorization.

221213212211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

Adding to 221213212211 its reverse (112212312122), we get a palindrome (333425524333).

The spelling of 221213212211 in words is "two hundred twenty-one billion, two hundred thirteen million, two hundred twelve thousand, two hundred eleven".