121366520 has 64 divisors (see below), whose sum is σ = 300659040. Its totient is φ = 43724800.

The previous prime is 121366513. The next prime is 121366523. The reversal of 121366520 is 25663121.

It is a self number, because there is not a number n which added to its sum of digits gives 121366520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121366523) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 48500 + ... + 50940.

Almost surely, 2^121366520 is an apocalyptic number.

121366520 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 121366520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150329520).

121366520 is an abundant number, since it is smaller than the sum of its proper divisors (179292520).

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

121366520 is a wasteful number, since it uses less digits than its factorization.

121366520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576 (or 2572 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 121366520 is about 11016.6474029080. The cubic root of 121366520 is about 495.1076458744.

The spelling of 121366520 in words is "one hundred twenty-one million, three hundred sixty-six thousand, five hundred twenty".