199044421 has 4 divisors (see below), whose sum is σ = 199242700. Its totient is φ = 198846144.

The previous prime is 199044409. The next prime is 199044431. The reversal of 199044421 is 124440991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48024900 + 151019521 = 6930^2 + 12289^2 .

It is a cyclic number.

It is not a de Polignac number, because 199044421 - 2²¹ = 196947269 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 (199044401) 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, 97626 + ... + 99643.

It is an arithmetic number, because the mean of its divisors is an integer number (49810675).

Almost surely, 2^199044421 is an apocalyptic number.

It is an amenable number.

199044421 is a deficient number, since it is larger than the sum of its proper divisors (198279).

199044421 is a wasteful number, since it uses less digits than its factorization.

199044421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198278.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 199044421 is about 14108.3103524129. The cubic root of 199044421 is about 583.8706837039.

The spelling of 199044421 in words is "one hundred ninety-nine million, forty-four thousand, four hundred twenty-one".