121317240 has 128 divisors (see below), whose sum is σ = 402796800. Its totient is φ = 28984320.

The previous prime is 121317239. The next prime is 121317257. The reversal of 121317240 is 42713121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95731 + ... + 96989.

It is an arithmetic number, because the mean of its divisors is an integer number (3146850).

Almost surely, 2^121317240 is an apocalyptic number.

121317240 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 121317240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201398400).

121317240 is an abundant number, since it is smaller than the sum of its proper divisors (281479560).

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

121317240 is a wasteful number, since it uses less digits than its factorization.

121317240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1353 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 121317240 is about 11014.4105607154. The cubic root of 121317240 is about 495.0406251731.

The spelling of 121317240 in words is "one hundred twenty-one million, three hundred seventeen thousand, two hundred forty".