121355638 has 16 divisors (see below), whose sum is σ = 190486656. Its totient is φ = 57913920.

The previous prime is 121355629. The next prime is 121355651. The reversal of 121355638 is 836553121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8881 + ... + 17932.

It is an arithmetic number, because the mean of its divisors is an integer number (11905416).

Almost surely, 2^121355638 is an apocalyptic number.

121355638 is a deficient number, since it is larger than the sum of its proper divisors (69131018).

121355638 is a wasteful number, since it uses less digits than its factorization.

121355638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26919.

The product of its digits is 21600, while the sum is 34.

The square root of 121355638 is about 11016.1535029247. The cubic root of 121355638 is about 495.0928479372.

The spelling of 121355638 in words is "one hundred twenty-one million, three hundred fifty-five thousand, six hundred thirty-eight".