221212222211211 has 64 divisors (see below), whose sum is σ = 389373111853056. Its totient is φ = 108152218944000.

The previous prime is 221212222211203. The next prime is 221212222211231. The reversal of 221212222211211 is 112112222212122.

It is not a de Polignac number, because 221212222211211 - 2³ = 221212222211203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221212222211231) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 122976436 + ... + 124762286.

It is an arithmetic number, because the mean of its divisors is an integer number (6083954872704).

Almost surely, 2^{221212222211211} is an apocalyptic number.

221212222211211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221212222211211 is a deficient number, since it is larger than the sum of its proper divisors (168160889641845).

221212222211211 is a wasteful number, since it uses less digits than its factorization.

221212222211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817432.

The product of its digits is 512, while the sum is 24.

Adding to 221212222211211 its reverse (112112222212122), we get a palindrome (333324444423333).

The spelling of 221212222211211 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred eleven thousand, two hundred eleven".