121321240 has 64 divisors (see below), whose sum is σ = 281685600. Its totient is φ = 47004672.

The previous prime is 121321237. The next prime is 121321243. The reversal of 121321240 is 42123121.

It is an interprime number because it is at equal distance from previous prime (121321237) and next prime (121321243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188359 + ... + 189001.

Almost surely, 2^121321240 is an apocalyptic number.

121321240 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 121321240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140842800).

121321240 is an abundant number, since it is smaller than the sum of its proper divisors (160364360).

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

121321240 is a wasteful number, since it uses less digits than its factorization.

121321240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 121321240 is about 11014.5921395211. The cubic root of 121321240 is about 495.0460658418.

Adding to 121321240 its reverse (42123121), we get a palindrome (163444361).

The spelling of 121321240 in words is "one hundred twenty-one million, three hundred twenty-one thousand, two hundred forty".