21210311202303 has 4 divisors (see below), whose sum is σ = 28280414936408. Its totient is φ = 14140207468200.

The previous prime is 21210311202299. The next prime is 21210311202313. The reversal of 21210311202303 is 30320211301212.

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

It is not a de Polignac number, because 21210311202303 - 2² = 21210311202299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210311202303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210311202313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535051867048 + ... + 3535051867053.

It is an arithmetic number, because the mean of its divisors is an integer number (7070103734102).

Almost surely, 2^{21210311202303} is an apocalyptic number.

21210311202303 is a deficient number, since it is larger than the sum of its proper divisors (7070103734105).

21210311202303 is an equidigital number, since it uses as much as digits as its factorization.

21210311202303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070103734104.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21210311202303 its reverse (30320211301212), we get a palindrome (51530522503515).

The spelling of 21210311202303 in words is "twenty-one trillion, two hundred ten billion, three hundred eleven million, two hundred two thousand, three hundred three".