121899036673 has 4 divisors (see below), whose sum is σ = 129069568260. Its totient is φ = 114728505088.

The previous prime is 121899036667. The next prime is 121899036689. The reversal of 121899036673 is 376630998121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97083965889 + 24815070784 = 311583^2 + 157528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121899036673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121899031673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3585265768 + ... + 3585265801.

It is an arithmetic number, because the mean of its divisors is an integer number (32267392065).

Almost surely, 2^121899036673 is an apocalyptic number.

It is an amenable number.

121899036673 is a deficient number, since it is larger than the sum of its proper divisors (7170531587).

121899036673 is an equidigital number, since it uses as much as digits as its factorization.

121899036673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7170531586.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 121899036673 in words is "one hundred twenty-one billion, eight hundred ninety-nine million, thirty-six thousand, six hundred seventy-three".