199216881 has 32 divisors (see below), whose sum is σ = 320716800. Its totient is φ = 121752720.

The previous prime is 199216837. The next prime is 199216889. The reversal of 199216881 is 188612991.

It is not a de Polignac number, because 199216881 - 2⁶ = 199216817 is a prime.

It is a super-2 number, since 2×199216881² = 79374731350736322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199216889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9640 + ... + 22166.

It is an arithmetic number, because the mean of its divisors is an integer number (10022400).

Almost surely, 2^199216881 is an apocalyptic number.

It is an amenable number.

199216881 is a deficient number, since it is larger than the sum of its proper divisors (121499919).

199216881 is a wasteful number, since it uses less digits than its factorization.

199216881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12586 (or 12580 counting only the distinct ones).

The product of its digits is 62208, while the sum is 45.

The square root of 199216881 is about 14114.4210295711. The cubic root of 199216881 is about 584.0392646162.

The spelling of 199216881 in words is "one hundred ninety-nine million, two hundred sixteen thousand, eight hundred eighty-one".