122221111128 has 32 divisors (see below), whose sum is σ = 315409320960. Its totient is φ = 39426164640.

The previous prime is 122221111127. The next prime is 122221111139. The reversal of 122221111128 is 821111122221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 122221111098 and 122221111107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122221111127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82137100 + ... + 82138587.

It is an arithmetic number, because the mean of its divisors is an integer number (9856541280).

Almost surely, 2^122221111128 is an apocalyptic number.

It is an amenable number.

122221111128 is an abundant number, since it is smaller than the sum of its proper divisors (193188209832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122221111128 is a wasteful number, since it uses less digits than its factorization.

122221111128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164275727 (or 164275723 counting only the distinct ones).

The product of its digits is 256, while the sum is 24.

Adding to 122221111128 its reverse (821111122221), we get a palindrome (943332233349).

The spelling of 122221111128 in words is "one hundred twenty-two billion, two hundred twenty-one million, one hundred eleven thousand, one hundred twenty-eight".