121422240 has 192 divisors, whose sum is σ = 431464320. Its totient is φ = 32285952.

The previous prime is 121422233. The next prime is 121422241. The reversal of 121422240 is 42224121.

121422240 is a `hidden beast` number, since 1 + 2 + 1 + 422 + 240 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (121422241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 349747 + ... + 350093.

It is an arithmetic number, because the mean of its divisors is an integer number (2247210).

Almost surely, 2^121422240 is an apocalyptic number.

121422240 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 121422240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215732160).

121422240 is an abundant number, since it is smaller than the sum of its proper divisors (310042080).

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

121422240 is an frugal number, since it uses more digits than its factorization.

121422240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 121422240 is about 11019.1760127516. The cubic root of 121422240 is about 495.1834031131.

Adding to 121422240 its reverse (42224121), we get a palindrome (163646361).

The spelling of 121422240 in words is "one hundred twenty-one million, four hundred twenty-two thousand, two hundred forty".