196858243573921 has 4 divisors (see below), whose sum is σ = 196926196025412. Its totient is φ = 196790291122432.

The previous prime is 196858243573891. The next prime is 196858243573951. The reversal of 196858243573921 is 129375342858691.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (196858243573891) and next prime (196858243573951).

It can be written as a sum of positive squares in 2 ways, for example, as 28504504559521 + 168353739014400 = 5338961^2 + 12975120^2 .

It is a cyclic number.

It is not a de Polignac number, because 196858243573921 - 2¹⁵ = 196858243541153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196858243573951) 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, 33976221400 + ... + 33976227193.

It is an arithmetic number, because the mean of its divisors is an integer number (49231549006353).

Almost surely, 2^{196858243573921} is an apocalyptic number.

It is an amenable number.

196858243573921 is a deficient number, since it is larger than the sum of its proper divisors (67952451491).

196858243573921 is an equidigital number, since it uses as much as digits as its factorization.

196858243573921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67952451490.

The product of its digits is 783820800, while the sum is 73.

The spelling of 196858243573921 in words is "one hundred ninety-six trillion, eight hundred fifty-eight billion, two hundred forty-three million, five hundred seventy-three thousand, nine hundred twenty-one".