121204100 has 72 divisors (see below), whose sum is σ = 273607488. Its totient is φ = 46569600.

The previous prime is 121204093. The next prime is 121204103. The reversal of 121204100 is 1402121.

It is not an unprimeable number, because it can be changed into a prime (121204103) 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, 305102 + ... + 305498.

It is an arithmetic number, because the mean of its divisors is an integer number (3800104).

Almost surely, 2^121204100 is an apocalyptic number.

121204100 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 121204100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136803744).

121204100 is an abundant number, since it is smaller than the sum of its proper divisors (152403388).

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

121204100 is a wasteful number, since it uses less digits than its factorization.

121204100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 121204100 is about 11009.2733638510. The cubic root of 121204100 is about 494.8866863028.

Adding to 121204100 its reverse (1402121), we get a palindrome (122606221).

The spelling of 121204100 in words is "one hundred twenty-one million, two hundred four thousand, one hundred".