122221111 has 4 divisors (see below), whose sum is σ = 122248224. Its totient is φ = 122194000.

The previous prime is 122221087. The next prime is 122221147. The reversal of 122221111 is 111122221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111122221 = 7 ⋅15874603.

It is a cyclic number.

It is not a de Polignac number, because 122221111 - 2⁵ = 122221079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122221091 and 122221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122221181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4990 + ... + 16411.

It is an arithmetic number, because the mean of its divisors is an integer number (30562056).

Almost surely, 2^122221111 is an apocalyptic number.

122221111 is a deficient number, since it is larger than the sum of its proper divisors (27113).

122221111 is an equidigital number, since it uses as much as digits as its factorization.

122221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27112.

The product of its digits is 16, while the sum is 13.

The square root of 122221111 is about 11055.3657108211. The cubic root of 122221111 is about 496.2670136523.

Adding to 122221111 its reverse (111122221), we get a palindrome (233343332).

It can be divided in two parts, 122221 and 111, that multiplied together give a palindrome (13566531).

The spelling of 122221111 in words is "one hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".