203421406 has 4 divisors (see below), whose sum is σ = 305132112. Its totient is φ = 101710702.

The previous prime is 203421401. The next prime is 203421431. The reversal of 203421406 is 604124302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203421401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50855350 + ... + 50855353.

It is an arithmetic number, because the mean of its divisors is an integer number (76283028).

Almost surely, 2^203421406 is an apocalyptic number.

203421406 is a deficient number, since it is larger than the sum of its proper divisors (101710706).

203421406 is a wasteful number, since it uses less digits than its factorization.

203421406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101710705.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 203421406 is about 14262.5876333855. The cubic root of 203421406 is about 588.1194610505.

Adding to 203421406 its reverse (604124302), we get a palindrome (807545708).

The spelling of 203421406 in words is "two hundred three million, four hundred twenty-one thousand, four hundred six".