121705955 has 24 divisors (see below), whose sum is σ = 170419968. Its totient is φ = 83196288.

The previous prime is 121705939. The next prime is 121705979. The reversal of 121705955 is 559507121.

It is not a de Polignac number, because 121705955 - 2⁴ = 121705939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

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 23 ways as a sum of consecutive naturals, for example, 111422 + ... + 112508.

It is an arithmetic number, because the mean of its divisors is an integer number (7100832).

Almost surely, 2^121705955 is an apocalyptic number.

121705955 is a deficient number, since it is larger than the sum of its proper divisors (48714013).

121705955 is a wasteful number, since it uses less digits than its factorization.

121705955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563 (or 1556 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 35.

The square root of 121705955 is about 11032.0421953508. The cubic root of 121705955 is about 495.5687846747.

The spelling of 121705955 in words is "one hundred twenty-one million, seven hundred five thousand, nine hundred fifty-five".