121698808447 has 4 divisors (see below), whose sum is σ = 121718873656. Its totient is φ = 121678743240.

The previous prime is 121698808433. The next prime is 121698808477. The reversal of 121698808447 is 744808896121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744808896121 = 239933 ⋅3104237.

It is a cyclic number.

It is not a de Polignac number, because 121698808447 - 2³¹ = 119551324799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121698808391 and 121698808400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121698808477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10023504 + ... + 10035637.

It is an arithmetic number, because the mean of its divisors is an integer number (30429718414).

Almost surely, 2^121698808447 is an apocalyptic number.

121698808447 is a deficient number, since it is larger than the sum of its proper divisors (20065209).

121698808447 is an equidigital number, since it uses as much as digits as its factorization.

121698808447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20065208.

The product of its (nonzero) digits is 6193152, while the sum is 58.

The spelling of 121698808447 in words is "one hundred twenty-one billion, six hundred ninety-eight million, eight hundred eight thousand, four hundred forty-seven".