199702042272721 has 16 divisors (see below), whose sum is σ = 206889355118160. Its totient is φ = 192534815334400.

The previous prime is 199702042272659. The next prime is 199702042272739. The reversal of 199702042272721 is 127272240207991.

It can be written as a sum of positive squares in 8 ways, for example, as 26744298477121 + 172957743795600 = 5171489^2 + 13151340^2 .

It is a cyclic number.

It is not a de Polignac number, because 199702042272721 - 2²³ = 199702033884113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199702042272221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 758404341 + ... + 758667613.

It is an arithmetic number, because the mean of its divisors is an integer number (12930584694885).

Almost surely, 2^{199702042272721} is an apocalyptic number.

It is an amenable number.

199702042272721 is a deficient number, since it is larger than the sum of its proper divisors (7187312845439).

199702042272721 is a wasteful number, since it uses less digits than its factorization.

199702042272721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301316.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 199702042272721 in words is "one hundred ninety-nine trillion, seven hundred two billion, forty-two million, two hundred seventy-two thousand, seven hundred twenty-one".