21144203211203 has 2 divisors, whose sum is σ = 21144203211204. Its totient is φ = 21144203211202.

The previous prime is 21144203211193. The next prime is 21144203211221. The reversal of 21144203211203 is 30211230244112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21144203211203 - 2⁸ = 21144203210947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21144203216203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572101605601 + 10572101605602.

It is an arithmetic number, because the mean of its divisors is an integer number (10572101605602).

Almost surely, 2^{21144203211203} is an apocalyptic number.

21144203211203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144203211203 is an equidigital number, since it uses as much as digits as its factorization.

21144203211203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21144203211203 its reverse (30211230244112), we get a palindrome (51355433455315).

The spelling of 21144203211203 in words is "twenty-one trillion, one hundred forty-four billion, two hundred three million, two hundred eleven thousand, two hundred three".