121100002100 has 144 divisors (see below), whose sum is σ = 333813384576. Its totient is φ = 37033152000.

The previous prime is 121100002097. The next prime is 121100002123. The reversal of 121100002100 is 1200001121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 259730 + ... + 556470.

It is an arithmetic number, because the mean of its divisors is an integer number (2318148504).

Almost surely, 2^121100002100 is an apocalyptic number.

121100002100 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 121100002100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166906692288).

121100002100 is an abundant number, since it is smaller than the sum of its proper divisors (212713382476).

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

121100002100 is a wasteful number, since it uses less digits than its factorization.

121100002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296826 (or 296819 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 121100002100 its reverse (1200001121), we get a palindrome (122300003221).

The spelling of 121100002100 in words is "one hundred twenty-one billion, one hundred million, two thousand, one hundred".