121220208 has 60 divisors (see below), whose sum is σ = 342404920. Its totient is φ = 40030848.

The previous prime is 121220201. The next prime is 121220213. The reversal of 121220208 is 802022121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11835 + ... + 19557.

Almost surely, 2^121220208 is an apocalyptic number.

121220208 is a gapful number since it is divisible by the number (18) 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 121220208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171202460).

121220208 is an abundant number, since it is smaller than the sum of its proper divisors (221184712).

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

121220208 is a wasteful number, since it uses less digits than its factorization.

121220208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7846 (or 7837 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 121220208 is about 11010.0049046311. The cubic root of 121220208 is about 494.9086087780.

Adding to 121220208 its reverse (802022121), we get a palindrome (923242329).

The spelling of 121220208 in words is "one hundred twenty-one million, two hundred twenty thousand, two hundred eight".