200421 has 16 divisors (see below), whose sum is σ = 320320. Its totient is φ = 123120.

The previous prime is 200407. The next prime is 200437. The reversal of 200421 is 124002.

It is not a de Polignac number, because 200421 - 2⁶ = 200357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66 + ... + 636.

It is an arithmetic number, because the mean of its divisors is an integer number (20020).

2²⁰⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

200421 is a deficient number, since it is larger than the sum of its proper divisors (119899).

200421 is a wasteful number, since it uses less digits than its factorization.

200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 587 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 200421 is about 447.6840403678. The cubic root of 200421 is about 58.5213597215.

Adding to 200421 its reverse (124002), we get a palindrome (324423).

It can be divided in two parts, 2004 and 21, that added together give a square (2025 = 45²).

The spelling of 200421 in words is "two hundred thousand, four hundred twenty-one", and thus it is an iban number.