21400203203 has 2 divisors, whose sum is σ = 21400203204. Its totient is φ = 21400203202.

The previous prime is 21400203179. The next prime is 21400203217. The reversal of 21400203203 is 30230200412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21400203203 - 2⁸ = 21400202947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21400203233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700101601 + 10700101602.

It is an arithmetic number, because the mean of its divisors is an integer number (10700101602).

Almost surely, 2^21400203203 is an apocalyptic number.

21400203203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400203203 is an equidigital number, since it uses as much as digits as its factorization.

21400203203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21400203203 its reverse (30230200412), we get a palindrome (51630403615).

The spelling of 21400203203 in words is "twenty-one billion, four hundred million, two hundred three thousand, two hundred three".