121902100 has 72 divisors (see below), whose sum is σ = 282169440. Its totient is φ = 45578880.

The previous prime is 121902089. The next prime is 121902103. The reversal of 121902100 is 1209121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121902103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157314 + ... + 158086.

It is an arithmetic number, because the mean of its divisors is an integer number (3919020).

Almost surely, 2^121902100 is an apocalyptic number.

121902100 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 121902100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141084720).

121902100 is an abundant number, since it is smaller than the sum of its proper divisors (160267340).

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

121902100 is a wasteful number, since it uses less digits than its factorization.

121902100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 121902100 is about 11040.9284029922. The cubic root of 121902100 is about 495.8348663340.

The spelling of 121902100 in words is "one hundred twenty-one million, nine hundred two thousand, one hundred".