122221111111 has 16 divisors (see below), whose sum is σ = 135680282496. Its totient is φ = 109170100000.

The previous prime is 122221111093. The next prime is 122221111127. The reversal of 122221111111 is 111111122221.

It is a cyclic number.

It is not a de Polignac number, because 122221111111 - 2¹³ = 122221102919 is a prime.

122221111111 is a modest number, since divided by 1111111 gives 12222 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122221111141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274345 + ... + 565426.

It is an arithmetic number, because the mean of its divisors is an integer number (8480017656).

Almost surely, 2^122221111111 is an apocalyptic number.

122221111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

122221111111 is a deficient number, since it is larger than the sum of its proper divisors (13459171385).

122221111111 is a wasteful number, since it uses less digits than its factorization.

122221111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840014.

The product of its digits is 16, while the sum is 16.

Adding to 122221111111 its reverse (111111122221), we get a palindrome (233332233332).

It can be divided in two parts, 122221 and 111111, that added together give a palindrome (233332).

The spelling of 122221111111 in words is "one hundred twenty-two billion, two hundred twenty-one million, one hundred eleven thousand, one hundred eleven".