121512215100 has 36 divisors (see below), whose sum is σ = 351575343224. Its totient is φ = 32403257280.

The previous prime is 121512214987. The next prime is 121512215119. The reversal of 121512215100 is 1512215121.

121512215100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202520059 + ... + 202520658.

Almost surely, 2^121512215100 is an apocalyptic number.

121512215100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121512215100 is an abundant number, since it is smaller than the sum of its proper divisors (230063128124).

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

121512215100 is a wasteful number, since it uses less digits than its factorization.

121512215100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405040734 (or 405040727 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 121512215100 its sum of digits (21), we get a palindrome (121512215121).

The spelling of 121512215100 in words is "one hundred twenty-one billion, five hundred twelve million, two hundred fifteen thousand, one hundred".