121131311100 has 36 divisors (see below), whose sum is σ = 350473260984. Its totient is φ = 32301682880.

The previous prime is 121131311087. The next prime is 121131311113. The reversal of 121131311100 is 1113131121.

It is an interprime number because it is at equal distance from previous prime (121131311087) and next prime (121131311113).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121131311100.

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, 201885219 + ... + 201885818.

Almost surely, 2^121131311100 is an apocalyptic number.

121131311100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121131311100 is an abundant number, since it is smaller than the sum of its proper divisors (229341949884).

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

121131311100 is a wasteful number, since it uses less digits than its factorization.

121131311100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403771054 (or 403771047 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 121131311100 its reverse (1113131121), we get a palindrome (122244442221).

The spelling of 121131311100 in words is "one hundred twenty-one billion, one hundred thirty-one million, three hundred eleven thousand, one hundred".