199371021 has 8 divisors (see below), whose sum is σ = 265893600. Its totient is φ = 132881232.

The previous prime is 199371017. The next prime is 199371037. The reversal of 199371021 is 120173991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199371021 - 2² = 199371017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199371421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17526 + ... + 26568.

It is an arithmetic number, because the mean of its divisors is an integer number (33236700).

Almost surely, 2^199371021 is an apocalyptic number.

It is an amenable number.

199371021 is a deficient number, since it is larger than the sum of its proper divisors (66522579).

199371021 is an equidigital number, since it uses as much as digits as its factorization.

199371021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16395.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 199371021 is about 14119.8803465185. The cubic root of 199371021 is about 584.1898552753.

The spelling of 199371021 in words is "one hundred ninety-nine million, three hundred seventy-one thousand, twenty-one".