122220100 has 36 divisors (see below), whose sum is σ = 267865668. Its totient is φ = 48400000.

The previous prime is 122220041. The next prime is 122220113. The reversal of 122220100 is 1022221.

It can be written as a sum of positive squares in 6 ways, for example, as 31741956 + 90478144 = 5634^2 + 9512^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4050 + ... + 16150.

It is an arithmetic number, because the mean of its divisors is an integer number (7440713).

Almost surely, 2^122220100 is an apocalyptic number.

122220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133932834).

122220100 is an abundant number, since it is smaller than the sum of its proper divisors (145645568).

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

122220100 is a wasteful number, since it uses less digits than its factorization.

122220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12216 (or 12209 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 122220100 is about 11055.3199863233. The cubic root of 122220100 is about 496.2656452926.

Adding to 122220100 its reverse (1022221), we get a palindrome (123242321).

The spelling of 122220100 in words is "one hundred twenty-two million, two hundred twenty thousand, one hundred".