21031001203 has 2 divisors, whose sum is σ = 21031001204. Its totient is φ = 21031001202.

The previous prime is 21031001149. The next prime is 21031001207. The reversal of 21031001203 is 30210013012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21031001203 - 2¹⁷ = 21030870131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21031001207) 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, 10515500601 + 10515500602.

It is an arithmetic number, because the mean of its divisors is an integer number (10515500602).

Almost surely, 2^21031001203 is an apocalyptic number.

21031001203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031001203 is an equidigital number, since it uses as much as digits as its factorization.

21031001203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21031001203 its reverse (30210013012), we get a palindrome (51241014215).

The spelling of 21031001203 in words is "twenty-one billion, thirty-one million, one thousand, two hundred three".