121243320 has 192 divisors, whose sum is σ = 455401440. Its totient is φ = 27648000.

The previous prime is 121243319. The next prime is 121243321. The reversal of 121243320 is 23342121.

121243320 is a `hidden beast` number, since 1 + 212 + 433 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (121243319) and next prime (121243321).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121243293 and 121243302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121243321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66420 + ... + 68220.

Almost surely, 2^121243320 is an apocalyptic number.

121243320 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 121243320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227700720).

121243320 is an abundant number, since it is smaller than the sum of its proper divisors (334158120).

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

121243320 is a wasteful number, since it uses less digits than its factorization.

121243320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846 (or 1839 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 121243320 is about 11011.0544454198. The cubic root of 121243320 is about 494.9400600822.

Adding to 121243320 its reverse (23342121), we get a palindrome (144585441).

The spelling of 121243320 in words is "one hundred twenty-one million, two hundred forty-three thousand, three hundred twenty".