121100222208 has 144 divisors (see below), whose sum is σ = 368714183936. Its totient is φ = 34565529600.

The previous prime is 121100222183. The next prime is 121100222213. The reversal of 121100222208 is 802222001121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5639460 + ... + 5660892.

Almost surely, 2^121100222208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121100222208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184357091968).

121100222208 is an abundant number, since it is smaller than the sum of its proper divisors (247613961728).

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

121100222208 is a wasteful number, since it uses less digits than its factorization.

121100222208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22510 (or 22496 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 121100222208 its reverse (802222001121), we get a palindrome (923322223329).

The spelling of 121100222208 in words is "one hundred twenty-one billion, one hundred million, two hundred twenty-two thousand, two hundred eight".