121240242 has 36 divisors (see below), whose sum is σ = 272091690. Its totient is φ = 39014976.

The previous prime is 121240219. The next prime is 121240253. The reversal of 121240242 is 242042121.

It can be written as a sum of positive squares in 3 ways, for example, as 111070521 + 10169721 = 10539^2 + 3189^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11134 + ... + 19142.

Almost surely, 2^121240242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121240242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136045845).

121240242 is an abundant number, since it is smaller than the sum of its proper divisors (150851448).

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

121240242 is a wasteful number, since it uses less digits than its factorization.

121240242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8075 (or 8043 counting only the distinct ones).

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

The square root of 121240242 is about 11010.9146759023. The cubic root of 121240242 is about 494.9358717046.

Adding to 121240242 its reverse (242042121), we get a palindrome (363282363).

The spelling of 121240242 in words is "one hundred twenty-one million, two hundred forty thousand, two hundred forty-two".