200400421 has 4 divisors (see below), whose sum is σ = 215815852. Its totient is φ = 184984992.

The previous prime is 200400401. The next prime is 200400491. The reversal of 200400421 is 124004002.

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 56040196 + 144360225 = 7486^2 + 12015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200400421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 15415417 = 200400421 / (2 + 0 + 0 + 4 + 0 + 0 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200400401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7707696 + ... + 7707721.

It is an arithmetic number, because the mean of its divisors is an integer number (53953963).

Almost surely, 2^200400421 is an apocalyptic number.

It is an amenable number.

200400421 is a deficient number, since it is larger than the sum of its proper divisors (15415431).

200400421 is a wasteful number, since it uses less digits than its factorization.

200400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15415430.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 200400421 is about 14156.2855650767. The cubic root of 200400421 is about 585.1935668407.

Adding to 200400421 its reverse (124004002), we get a palindrome (324404423).

The spelling of 200400421 in words is "two hundred million, four hundred thousand, four hundred twenty-one".