121320100000 has 144 divisors (see below), whose sum is σ = 325685217312. Its totient is φ = 44116000000.

The previous prime is 121320099913. The next prime is 121320100019. The reversal of 121320100000 is 1023121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 121320100000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1044855 + ... + 1155145.

It is an arithmetic number, because the mean of its divisors is an integer number (2261702898).

Almost surely, 2^121320100000 is an apocalyptic number.

121320100000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121320100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162842608656).

121320100000 is an abundant number, since it is smaller than the sum of its proper divisors (204365117312).

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

121320100000 is an equidigital number, since it uses as much as digits as its factorization.

121320100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110337 (or 110309 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 121320100000 its reverse (1023121), we get a palindrome (121321123121).

The spelling of 121320100000 in words is "one hundred twenty-one billion, three hundred twenty million, one hundred thousand".