121231132120 has 128 divisors (see below), whose sum is σ = 316874701440. Its totient is φ = 40883097600.

The previous prime is 121231132117. The next prime is 121231132123. The reversal of 121231132120 is 21231132121.

It is an interprime number because it is at equal distance from previous prime (121231132117) and next prime (121231132123).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231132123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7616170 + ... + 7632070.

It is an arithmetic number, because the mean of its divisors is an integer number (2475583605).

Almost surely, 2^121231132120 is an apocalyptic number.

121231132120 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 121231132120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158437350720).

121231132120 is an abundant number, since it is smaller than the sum of its proper divisors (195643569320).

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

121231132120 is a wasteful number, since it uses less digits than its factorization.

121231132120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16365 (or 16361 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121231132120 its reverse (21231132121), we get a palindrome (142462264241).

Subtracting from 121231132120 its reverse (21231132121), we obtain a palindrome (99999999999).

The spelling of 121231132120 in words is "one hundred twenty-one billion, two hundred thirty-one million, one hundred thirty-two thousand, one hundred twenty".