121715144 has 16 divisors (see below), whose sum is σ = 228711600. Its totient is φ = 60725392.

The previous prime is 121715123. The next prime is 121715161. The reversal of 121715144 is 441517121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12554 + ... + 20025.

It is an arithmetic number, because the mean of its divisors is an integer number (14294475).

Almost surely, 2^121715144 is an apocalyptic number.

It is an amenable number.

121715144 is a deficient number, since it is larger than the sum of its proper divisors (106996456).

121715144 is a wasteful number, since it uses less digits than its factorization.

121715144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33052 (or 33048 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 121715144 is about 11032.4586561655. The cubic root of 121715144 is about 495.5812564472.

It can be divided in two parts, 1217 and 15144, that added together give a palindrome (16361).

The spelling of 121715144 in words is "one hundred twenty-one million, seven hundred fifteen thousand, one hundred forty-four".