199001721813 has 4 divisors (see below), whose sum is σ = 265335629088. Its totient is φ = 132667814540.

The previous prime is 199001721797. The next prime is 199001721833. The reversal of 199001721813 is 318127100991.

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 199001721813 - 2⁴ = 199001721797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199001721833) 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, 33166953633 + ... + 33166953638.

It is an arithmetic number, because the mean of its divisors is an integer number (66333907272).

Almost surely, 2^199001721813 is an apocalyptic number.

It is an amenable number.

199001721813 is a deficient number, since it is larger than the sum of its proper divisors (66333907275).

199001721813 is an equidigital number, since it uses as much as digits as its factorization.

199001721813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66333907274.

The product of its (nonzero) digits is 27216, while the sum is 42.

The spelling of 199001721813 in words is "one hundred ninety-nine billion, one million, seven hundred twenty-one thousand, eight hundred thirteen".