221212222113211 has 4 divisors (see below), whose sum is σ = 252813968129392. Its totient is φ = 189610476097032.

The previous prime is 221212222113193. The next prime is 221212222113247. The reversal of 221212222113211 is 112311222212122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221212222113211 - 2⁹ = 221212222112699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212222173211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15800873008080 + ... + 15800873008093.

It is an arithmetic number, because the mean of its divisors is an integer number (63203492032348).

Almost surely, 2^{221212222113211} is an apocalyptic number.

221212222113211 is a deficient number, since it is larger than the sum of its proper divisors (31601746016181).

221212222113211 is an equidigital number, since it uses as much as digits as its factorization.

221212222113211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31601746016180.

The product of its digits is 768, while the sum is 25.

Adding to 221212222113211 its reverse (112311222212122), we get a palindrome (333523444325333).

The spelling of 221212222113211 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred thirteen thousand, two hundred eleven".