121605002100 has 108 divisors (see below), whose sum is σ = 381256118880. Its totient is φ = 32420174400.

The previous prime is 121605002087. The next prime is 121605002147. The reversal of 121605002100 is 1200506121.

121605002100 is a `hidden beast` number, since 1 + 2 + 1 + 60 + 500 + 2 + 100 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4370031 + ... + 4397769.

Almost surely, 2^121605002100 is an apocalyptic number.

121605002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121605002100 is an abundant number, since it is smaller than the sum of its proper divisors (259651116780).

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

121605002100 is a wasteful number, since it uses less digits than its factorization.

121605002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32630 (or 32620 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 121605002100 its reverse (1200506121), we get a palindrome (122805508221).

The spelling of 121605002100 in words is "one hundred twenty-one billion, six hundred five million, two thousand, one hundred".