121727686 has 4 divisors (see below), whose sum is σ = 182591532. Its totient is φ = 60863842.

The previous prime is 121727681. The next prime is 121727693. The reversal of 121727686 is 686727121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 686727121 = 17 ⋅40395713.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121727681) 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 as a sum of consecutive naturals, namely, 30431920 + ... + 30431923.

It is an arithmetic number, because the mean of its divisors is an integer number (45647883).

Almost surely, 2^121727686 is an apocalyptic number.

121727686 is a deficient number, since it is larger than the sum of its proper divisors (60863846).

121727686 is an equidigital number, since it uses as much as digits as its factorization.

121727686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60863845.

The product of its digits is 56448, while the sum is 40.

The square root of 121727686 is about 11033.0270551649. The cubic root of 121727686 is about 495.5982780668.

The spelling of 121727686 in words is "one hundred twenty-one million, seven hundred twenty-seven thousand, six hundred eighty-six".