121121002100 has 72 divisors (see below), whose sum is σ = 310069820928. Its totient is φ = 40187606400.

The previous prime is 121121002099. The next prime is 121121002109. The reversal of 121121002100 is 1200121121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121002109) 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, 2769107 + ... + 2812506.

Almost surely, 2^121121002100 is an apocalyptic number.

121121002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121002100 is an abundant number, since it is smaller than the sum of its proper divisors (188948818828).

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

121121002100 is a wasteful number, since it uses less digits than its factorization.

121121002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5581665 (or 5581658 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121121002100 its reverse (1200121121), we get a palindrome (122321123221).

The spelling of 121121002100 in words is "one hundred twenty-one billion, one hundred twenty-one million, two thousand, one hundred".