199442421 has 12 divisors (see below), whose sum is σ = 288246400. Its totient is φ = 132886440.

The previous prime is 199442417. The next prime is 199442431. The reversal of 199442421 is 124244991.

199442421 is a `hidden beast` number, since 199 + 4 + 42 + 421 = 666.

It is not a de Polignac number, because 199442421 - 2² = 199442417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199442431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13980 + ... + 24378.

Almost surely, 2^199442421 is an apocalyptic number.

It is an amenable number.

199442421 is a deficient number, since it is larger than the sum of its proper divisors (88803979).

199442421 is a wasteful number, since it uses less digits than its factorization.

199442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12536 (or 12533 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 199442421 is about 14122.4084702291. The cubic root of 199442421 is about 584.2595848631.

The spelling of 199442421 in words is "one hundred ninety-nine million, four hundred forty-two thousand, four hundred twenty-one".