121273666993 has 4 divisors (see below), whose sum is σ = 121274465908. Its totient is φ = 121272868080.

The previous prime is 121273666981. The next prime is 121273667089. The reversal of 121273666993 is 399666372121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10246095729 + 111027571264 = 101223^2 + 333208^2 .

It is a cyclic number.

It is not a de Polignac number, because 121273666993 - 2¹³ = 121273658801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121273636993) 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, 93798 + ... + 501343.

It is an arithmetic number, because the mean of its divisors is an integer number (30318616477).

Almost surely, 2^121273666993 is an apocalyptic number.

It is an amenable number.

121273666993 is a deficient number, since it is larger than the sum of its proper divisors (798915).

121273666993 is an equidigital number, since it uses as much as digits as its factorization.

121273666993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798914.

The product of its digits is 4408992, while the sum is 55.

The spelling of 121273666993 in words is "one hundred twenty-one billion, two hundred seventy-three million, six hundred sixty-six thousand, nine hundred ninety-three".