211201221111 has 8 divisors (see below), whose sum is σ = 283229383920. Its totient is φ = 139986936192.

The previous prime is 211201221073. The next prime is 211201221151. The reversal of 211201221111 is 111122102112.

It is a happy number.

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

It is not a de Polignac number, because 211201221111 - 2¹⁷ = 211201090039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211201221151) 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, 203468866 + ... + 203469903.

It is an arithmetic number, because the mean of its divisors is an integer number (35403672990).

Almost surely, 2^211201221111 is an apocalyptic number.

211201221111 is a deficient number, since it is larger than the sum of its proper divisors (72028162809).

211201221111 is a wasteful number, since it uses less digits than its factorization.

211201221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406938945.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211201221111 its reverse (111122102112), we get a palindrome (322323323223).

The spelling of 211201221111 in words is "two hundred eleven billion, two hundred one million, two hundred twenty-one thousand, one hundred eleven".