200655421 has 4 divisors (see below), whose sum is σ = 200683872. Its totient is φ = 200626972.

The previous prime is 200655391. The next prime is 200655449. The reversal of 200655421 is 124556002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 124556002 = 2 ⋅62278001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200655421 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 (200655491) 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, 5160 + ... + 20686.

It is an arithmetic number, because the mean of its divisors is an integer number (50170968).

Almost surely, 2^200655421 is an apocalyptic number.

It is an amenable number.

200655421 is a deficient number, since it is larger than the sum of its proper divisors (28451).

200655421 is a wasteful number, since it uses less digits than its factorization.

200655421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28450.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 200655421 is about 14165.2893016698. The cubic root of 200655421 is about 585.4416719592.

The spelling of 200655421 in words is "two hundred million, six hundred fifty-five thousand, four hundred twenty-one".