121541100000 has 288 divisors, whose sum is σ = 419789381760. Its totient is φ = 30703680000.

The previous prime is 121541099959. The next prime is 121541100001. The reversal of 121541100000 is 1145121.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121541100001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5689339 + ... + 5710661.

It is an arithmetic number, because the mean of its divisors is an integer number (1457602020).

Almost surely, 2^121541100000 is an apocalyptic number.

121541100000 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 121541100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209894690880).

121541100000 is an abundant number, since it is smaller than the sum of its proper divisors (298248281760).

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

121541100000 is an equidigital number, since it uses as much as digits as its factorization.

121541100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21380 (or 21352 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 121541100000 its reverse (1145121), we get a palindrome (121542245121).

The spelling of 121541100000 in words is "one hundred twenty-one billion, five hundred forty-one million, one hundred thousand".