121771705 has 16 divisors (see below), whose sum is σ = 160636608. Its totient is φ = 87880000.

The previous prime is 121771673. The next prime is 121771709. The reversal of 121771705 is 507177121.

It is not a de Polignac number, because 121771705 - 2⁵ = 121771673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121771709) 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 15 ways as a sum of consecutive naturals, for example, 1246 + ... + 15655.

It is an arithmetic number, because the mean of its divisors is an integer number (10039788).

Almost surely, 2^121771705 is an apocalyptic number.

It is an amenable number.

121771705 is a deficient number, since it is larger than the sum of its proper divisors (38864903).

121771705 is a wasteful number, since it uses less digits than its factorization.

121771705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17048.

The product of its (nonzero) digits is 3430, while the sum is 31.

The square root of 121771705 is about 11035.0217489591. The cubic root of 121771705 is about 495.6580100587.

The spelling of 121771705 in words is "one hundred twenty-one million, seven hundred seventy-one thousand, seven hundred five".