121751673217 has 4 divisors (see below), whose sum is σ = 121753052080. Its totient is φ = 121750294356.

The previous prime is 121751673203. The next prime is 121751673247. The reversal of 121751673217 is 712376157121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121751673217 - 2⁷ = 121751673089 is a prime.

It is a super-2 number, since 2×121751673217² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121751673247) 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, 547203 + ... + 736840.

It is an arithmetic number, because the mean of its divisors is an integer number (30438263020).

Almost surely, 2^121751673217 is an apocalyptic number.

It is an amenable number.

121751673217 is a deficient number, since it is larger than the sum of its proper divisors (1378863).

121751673217 is an equidigital number, since it uses as much as digits as its factorization.

121751673217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378862.

The product of its digits is 123480, while the sum is 43.

The spelling of 121751673217 in words is "one hundred twenty-one billion, seven hundred fifty-one million, six hundred seventy-three thousand, two hundred seventeen".