121131200000 has 120 divisors (see below), whose sum is σ = 302516903304. Its totient is φ = 48451840000.

The previous prime is 121131199841. The next prime is 121131200059. The reversal of 121131200000 is 2131121.

It is a super-2 number, since 2×121131200000² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1562147 + ... + 1637853.

Almost surely, 2^121131200000 is an apocalyptic number.

121131200000 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 121131200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151258451652).

121131200000 is an abundant number, since it is smaller than the sum of its proper divisors (181385703304).

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

121131200000 is an frugal number, since it uses more digits than its factorization.

121131200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75750 (or 75714 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 121131200000 its reverse (2131121), we get a palindrome (121133331121).

The spelling of 121131200000 in words is "one hundred twenty-one billion, one hundred thirty-one million, two hundred thousand".