21400203 has 16 divisors (see below), whose sum is σ = 31640832. Its totient is φ = 12756000.

The previous prime is 21400201. The next prime is 21400217. The reversal of 21400203 is 30200412.

It is not a de Polignac number, because 21400203 - 2¹ = 21400201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21400201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3303 + ... + 7328.

It is an arithmetic number, because the mean of its divisors is an integer number (1977552).

Almost surely, 2^21400203 is an apocalyptic number.

21400203 is a deficient number, since it is larger than the sum of its proper divisors (10240629).

21400203 is a wasteful number, since it uses less digits than its factorization.

21400203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10706.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21400203 is about 4626.0353435745. The cubic root of 21400203 is about 277.6339877259.

Adding to 21400203 its reverse (30200412), we get a palindrome (51600615).

The spelling of 21400203 in words is "twenty-one million, four hundred thousand, two hundred three".