121706817 has 4 divisors (see below), whose sum is σ = 162275760. Its totient is φ = 81137876.

The previous prime is 121706803. The next prime is 121706821. The reversal of 121706817 is 718607121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 718607121 = 3 ⋅239535707.

It is a cyclic number.

It is not a de Polignac number, because 121706817 - 2⁸ = 121706561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121706887) 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, 20284467 + ... + 20284472.

It is an arithmetic number, because the mean of its divisors is an integer number (40568940).

Almost surely, 2^121706817 is an apocalyptic number.

It is an amenable number.

121706817 is a deficient number, since it is larger than the sum of its proper divisors (40568943).

121706817 is an equidigital number, since it uses as much as digits as its factorization.

121706817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40568942.

The product of its (nonzero) digits is 4704, while the sum is 33.

The square root of 121706817 is about 11032.0812632975. The cubic root of 121706817 is about 495.5699546510.

The spelling of 121706817 in words is "one hundred twenty-one million, seven hundred six thousand, eight hundred seventeen".