121331100 has 72 divisors (see below), whose sum is σ = 382975488. Its totient is φ = 29412800.

The previous prime is 121331069. The next prime is 121331107. The reversal of 121331100 is 1133121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121331107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15084 + ... + 21683.

It is an arithmetic number, because the mean of its divisors is an integer number (5319104).

Almost surely, 2^121331100 is an apocalyptic number.

121331100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121331100 is an abundant number, since it is smaller than the sum of its proper divisors (261644388).

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

121331100 is a wasteful number, since it uses less digits than its factorization.

121331100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36795 (or 36788 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 121331100 is about 11015.0397184940. The cubic root of 121331100 is about 495.0594765795.

Adding to 121331100 its reverse (1133121), we get a palindrome (122464221).

The spelling of 121331100 in words is "one hundred twenty-one million, three hundred thirty-one thousand, one hundred".