121788105 has 32 divisors (see below), whose sum is σ = 204374016. Its totient is φ = 61811904.

The previous prime is 121788103. The next prime is 121788133. The reversal of 121788105 is 501887121.

It is not a de Polignac number, because 121788105 - 2¹ = 121788103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121788103) 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 31 ways as a sum of consecutive naturals, for example, 76144 + ... + 77726.

It is an arithmetic number, because the mean of its divisors is an integer number (6386688).

Almost surely, 2^121788105 is an apocalyptic number.

121788105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121788105 is a deficient number, since it is larger than the sum of its proper divisors (82585911).

121788105 is a wasteful number, since it uses less digits than its factorization.

121788105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837.

The product of its (nonzero) digits is 4480, while the sum is 33.

The square root of 121788105 is about 11035.7648126444. The cubic root of 121788105 is about 495.6802605108.

The spelling of 121788105 in words is "one hundred twenty-one million, seven hundred eighty-eight thousand, one hundred five".