122221212111 has 48 divisors (see below), whose sum is σ = 184734501120. Its totient is φ = 77796633600.

The previous prime is 122221212107. The next prime is 122221212131. The reversal of 122221212111 is 111212122221.

122221212111 is a `hidden beast` number, since 122 + 221 + 212 + 111 = 666.

It is not a de Polignac number, because 122221212111 - 2² = 122221212107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122221212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3784450 + ... + 3816608.

It is an arithmetic number, because the mean of its divisors is an integer number (3848635440).

Almost surely, 2^122221212111 is an apocalyptic number.

122221212111 is a deficient number, since it is larger than the sum of its proper divisors (62513289009).

122221212111 is a wasteful number, since it uses less digits than its factorization.

122221212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32416 (or 32413 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 122221212111 its reverse (111212122221), we get a palindrome (233433334332).

The spelling of 122221212111 in words is "one hundred twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, one hundred eleven".