199420421 has 4 divisors (see below), whose sum is σ = 211151052. Its totient is φ = 187689792.

The previous prime is 199420399. The next prime is 199420439. The reversal of 199420421 is 124024991.

199420421 = 9985² + 9986².

199420421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 99720196 + 99700225 = 9986^2 + 9985^2 .

It is not a de Polignac number, because 199420421 - 2⁶ = 199420357 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 (199420621) 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, 5865290 + ... + 5865323.

It is an arithmetic number, because the mean of its divisors is an integer number (52787763).

Almost surely, 2^199420421 is an apocalyptic number.

199420421 is the 9986-th centered square number.

It is an amenable number.

199420421 is a deficient number, since it is larger than the sum of its proper divisors (11730631).

199420421 is a wasteful number, since it uses less digits than its factorization.

199420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11730630.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 199420421 is about 14121.6295447799. The cubic root of 199420421 is about 584.2381013301.

The spelling of 199420421 in words is "one hundred ninety-nine million, four hundred twenty thousand, four hundred twenty-one".