221212122112211 has 4 divisors (see below), whose sum is σ = 223492659453672. Its totient is φ = 218931584770752.

The previous prime is 221212122112097. The next prime is 221212122112279. The reversal of 221212122112211 is 112211221212122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221212122112211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212122117211) 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, 1140268670585 + ... + 1140268670778.

It is an arithmetic number, because the mean of its divisors is an integer number (55873164863418).

Almost surely, 2^{221212122112211} is an apocalyptic number.

221212122112211 is a deficient number, since it is larger than the sum of its proper divisors (2280537341461).

221212122112211 is an equidigital number, since it uses as much as digits as its factorization.

221212122112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280537341460.

The product of its digits is 256, while the sum is 23.

Adding to 221212122112211 its reverse (112211221212122), we get a palindrome (333423343324333).

The spelling of 221212122112211 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, one hundred twelve thousand, two hundred eleven".