121315535 has 16 divisors (see below), whose sum is σ = 159230880. Its totient is φ = 87997440.

The previous prime is 121315531. The next prime is 121315549. The reversal of 121315535 is 535513121.

It is a happy number.

It is not a de Polignac number, because 121315535 - 2² = 121315531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121315531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19799 + ... + 25191.

It is an arithmetic number, because the mean of its divisors is an integer number (9951930).

Almost surely, 2^121315535 is an apocalyptic number.

121315535 is a deficient number, since it is larger than the sum of its proper divisors (37915345).

121315535 is a wasteful number, since it uses less digits than its factorization.

121315535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5818.

The product of its digits is 2250, while the sum is 26.

The square root of 121315535 is about 11014.3331618396. Note that the first 3 decimals coincide. The cubic root of 121315535 is about 495.0383060517.

Adding to 121315535 its reverse (535513121), we get a palindrome (656828656).

The spelling of 121315535 in words is "one hundred twenty-one million, three hundred fifteen thousand, five hundred thirty-five".