121665742 has 48 divisors (see below), whose sum is σ = 208335456. Its totient is φ = 53222400.

The previous prime is 121665703. The next prime is 121665743. The reversal of 121665742 is 247566121.

It is a junction number, because it is equal to n+sod(n) for n = 121665698 and 121665707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121665743) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1254238 + ... + 1254334.

It is an arithmetic number, because the mean of its divisors is an integer number (4340322).

Almost surely, 2^121665742 is an apocalyptic number.

121665742 is a deficient number, since it is larger than the sum of its proper divisors (86669714).

121665742 is a wasteful number, since it uses less digits than its factorization.

121665742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 254 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 121665742 is about 11030.2194901099. The cubic root of 121665742 is about 495.5141981844.

The spelling of 121665742 in words is "one hundred twenty-one million, six hundred sixty-five thousand, seven hundred forty-two".