121711538 has 16 divisors (see below), whose sum is σ = 205160256. Its totient is φ = 53731920.

The previous prime is 121711523. The next prime is 121711547. The reversal of 121711538 is 835117121.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121711538.

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 7 ways as a sum of consecutive naturals, for example, 101168 + ... + 102363.

It is an arithmetic number, because the mean of its divisors is an integer number (12822516).

Almost surely, 2^121711538 is an apocalyptic number.

121711538 is a deficient number, since it is larger than the sum of its proper divisors (83448718).

121711538 is a wasteful number, since it uses less digits than its factorization.

121711538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203569.

The product of its digits is 1680, while the sum is 29.

The square root of 121711538 is about 11032.2952281019. The cubic root of 121711538 is about 495.5763622776.

Adding to 121711538 its reverse (835117121), we get a palindrome (956828659).

The spelling of 121711538 in words is "one hundred twenty-one million, seven hundred eleven thousand, five hundred thirty-eight".