200421405 has 32 divisors (see below), whose sum is σ = 375062400. Its totient is φ = 101264256.

The previous prime is 200421391. The next prime is 200421413. The reversal of 200421405 is 504124002.

200421405 is a `hidden beast` number, since 200 + 421 + 40 + 5 = 666.

200421405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 200421405 - 2¹⁴ = 200405021 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36504 + ... + 41633.

It is an arithmetic number, because the mean of its divisors is an integer number (11720700).

Almost surely, 2^200421405 is an apocalyptic number.

It is an amenable number.

200421405 is a deficient number, since it is larger than the sum of its proper divisors (174640995).

200421405 is a wasteful number, since it uses less digits than its factorization.

200421405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78170 (or 78164 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 200421405 is about 14157.0267005470. The cubic root of 200421405 is about 585.2139914040.

Adding to 200421405 its reverse (504124002), we get a palindrome (704545407).

It can be divided in two parts, 2004 and 21405, that added together give a square (23409 = 153²).

The spelling of 200421405 in words is "two hundred million, four hundred twenty-one thousand, four hundred five".