121243765 has 16 divisors (see below), whose sum is σ = 149800896. Its totient is φ = 94147200.

The previous prime is 121243757. The next prime is 121243777. The reversal of 121243765 is 567342121.

It is not a de Polignac number, because 121243765 - 2³ = 121243757 is a prime.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 41854 + ... + 44656.

It is an arithmetic number, because the mean of its divisors is an integer number (9362556).

Almost surely, 2^121243765 is an apocalyptic number.

It is an amenable number.

121243765 is a deficient number, since it is larger than the sum of its proper divisors (28557131).

121243765 is a wasteful number, since it uses less digits than its factorization.

121243765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060.

The product of its digits is 10080, while the sum is 31.

The square root of 121243765 is about 11011.0746523670. The cubic root of 121243765 is about 494.9406656085.

Adding to 121243765 its reverse (567342121), we get a palindrome (688585886).

The spelling of 121243765 in words is "one hundred twenty-one million, two hundred forty-three thousand, seven hundred sixty-five".