221212112111211 has 8 divisors (see below), whose sum is σ = 317637904570000. Its totient is φ = 136130530529952.

The previous prime is 221212112111173. The next prime is 221212112111219. The reversal of 221212112111211 is 112111211212122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221212112111211 - 2⁶ = 221212112111147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212112111219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2836052719336 + ... + 2836052719413.

It is an arithmetic number, because the mean of its divisors is an integer number (39704738071250).

Almost surely, 2^{221212112111211} is an apocalyptic number.

221212112111211 is a deficient number, since it is larger than the sum of its proper divisors (96425792458789).

221212112111211 is a wasteful number, since it uses less digits than its factorization.

221212112111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672105438765.

The product of its digits is 64, while the sum is 21.

Adding to 221212112111211 its reverse (112111211212122), we get a palindrome (333323323323333).

The spelling of 221212112111211 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twelve million, one hundred eleven thousand, two hundred eleven".