121131520 has 40 divisors (see below), whose sum is σ = 290437884. Its totient is φ = 48451584.

The previous prime is 121131503. The next prime is 121131533. The reversal of 121131520 is 25131121.

It can be written as a sum of positive squares in 2 ways, for example, as 118722816 + 2408704 = 10896^2 + 1552^2 .

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 = 121131494 and 121131503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21099 + ... + 26218.

Almost surely, 2^121131520 is an apocalyptic number.

121131520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121131520 is an abundant number, since it is smaller than the sum of its proper divisors (169306364).

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

121131520 is an frugal number, since it uses more digits than its factorization.

121131520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47340 (or 47324 counting only the distinct ones).

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

The square root of 121131520 is about 11005.9765582160. The cubic root of 121131520 is about 494.7878831331.

Adding to 121131520 its reverse (25131121), we get a palindrome (146262641).

The spelling of 121131520 in words is "one hundred twenty-one million, one hundred thirty-one thousand, five hundred twenty".