121317520 has 40 divisors (see below), whose sum is σ = 284821056. Its totient is φ = 48052608.

The previous prime is 121317517. The next prime is 121317523. The reversal of 121317520 is 25713121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121317517) and next prime (121317523).

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

It is a junction number, because it is equal to n+sod(n) for n = 121317491 and 121317500.

It is not an unprimeable number, because it can be changed into a prime (121317523) 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, 879 + ... + 15601.

Almost surely, 2^121317520 is an apocalyptic number.

121317520 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 121317520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142410528).

121317520 is an abundant number, since it is smaller than the sum of its proper divisors (163503536).

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

121317520 is a wasteful number, since it uses less digits than its factorization.

121317520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14839 (or 14833 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 121317520 is about 11014.4232713293. The cubic root of 121317520 is about 495.0410060238.

The spelling of 121317520 in words is "one hundred twenty-one million, three hundred seventeen thousand, five hundred twenty".