121531120 has 40 divisors (see below), whose sum is σ = 287901216. Its totient is φ = 47693568.

The previous prime is 121531117. The next prime is 121531127. The reversal of 121531120 is 21135121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 121531094 and 121531103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121531127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10092 + ... + 18571.

Almost surely, 2^121531120 is an apocalyptic number.

121531120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121531120 is an abundant number, since it is smaller than the sum of its proper divisors (166370096).

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

121531120 is a wasteful number, since it uses less digits than its factorization.

121531120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28729 (or 28723 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 121531120 is about 11024.1153840115. The cubic root of 121531120 is about 495.3313701343.

Adding to 121531120 its reverse (21135121), we get a palindrome (142666241).

The spelling of 121531120 in words is "one hundred twenty-one million, five hundred thirty-one thousand, one hundred twenty".