121432520 has 64 divisors (see below), whose sum is σ = 306158400. Its totient is φ = 42958080.

The previous prime is 121432469. The next prime is 121432543. The reversal of 121432520 is 25234121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121432492 and 121432501.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12551 + ... + 20009.

It is an arithmetic number, because the mean of its divisors is an integer number (4783725).

Almost surely, 2^121432520 is an apocalyptic number.

121432520 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 121432520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153079200).

121432520 is an abundant number, since it is smaller than the sum of its proper divisors (184725880).

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

121432520 is a wasteful number, since it uses less digits than its factorization.

121432520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7518 (or 7514 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 121432520 is about 11019.6424624395. The cubic root of 121432520 is about 495.1973773288.

Adding to 121432520 its reverse (25234121), we get a palindrome (146666641).

The spelling of 121432520 in words is "one hundred twenty-one million, four hundred thirty-two thousand, five hundred twenty".