121223240 has 16 divisors (see below), whose sum is σ = 272752380. Its totient is φ = 48489280.

The previous prime is 121223239. The next prime is 121223257. The reversal of 121223240 is 42322121.

It can be written as a sum of positive squares in 2 ways, for example, as 121132036 + 91204 = 11006^2 + 302^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1515251 + ... + 1515330.

Almost surely, 2^121223240 is an apocalyptic number.

121223240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121223240 is an abundant number, since it is smaller than the sum of its proper divisors (151529140).

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

121223240 is a wasteful number, since it uses less digits than its factorization.

121223240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030592 (or 3030588 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 121223240 is about 11010.1425967151. The cubic root of 121223240 is about 494.9127350163.

Adding to 121223240 its reverse (42322121), we get a palindrome (163545361).

The spelling of 121223240 in words is "one hundred twenty-one million, two hundred twenty-three thousand, two hundred forty".