121761231200 has 72 divisors (see below), whose sum is σ = 339713850672. Its totient is φ = 41746705920.

The previous prime is 121761231197. The next prime is 121761231209. The reversal of 121761231200 is 2132167121.

It is a self number, because there is not a number n which added to its sum of digits gives 121761231200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121761231209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10865939 + ... + 10877138.

It is an arithmetic number, because the mean of its divisors is an integer number (4718247926).

Almost surely, 2^121761231200 is an apocalyptic number.

121761231200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121761231200 is an abundant number, since it is smaller than the sum of its proper divisors (217952619472).

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

121761231200 is a wasteful number, since it uses less digits than its factorization.

121761231200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21743104 (or 21743091 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 121761231200 its reverse (2132167121), we get a palindrome (123893398321).

The spelling of 121761231200 in words is "one hundred twenty-one billion, seven hundred sixty-one million, two hundred thirty-one thousand, two hundred".