121442440 has 32 divisors (see below), whose sum is σ = 312281280. Its totient is φ = 41637312.

The previous prime is 121442437. The next prime is 121442443. The reversal of 121442440 is 44244121.

It is an interprime number because it is at equal distance from previous prime (121442437) and next prime (121442443).

It is not an unprimeable number, because it can be changed into a prime (121442443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216582 + ... + 217141.

It is an arithmetic number, because the mean of its divisors is an integer number (9758790).

Almost surely, 2^121442440 is an apocalyptic number.

121442440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121442440 is an abundant number, since it is smaller than the sum of its proper divisors (190838840).

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

121442440 is a wasteful number, since it uses less digits than its factorization.

121442440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433741 (or 433737 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 121442440 is about 11020.0925585950. The cubic root of 121442440 is about 495.2108614274.

Adding to 121442440 its reverse (44244121), we get a palindrome (165686561).

The spelling of 121442440 in words is "one hundred twenty-one million, four hundred forty-two thousand, four hundred forty".