21021303210223 has 4 divisors (see below), whose sum is σ = 21021398238240. Its totient is φ = 21021208182208.

The previous prime is 21021303210197. The next prime is 21021303210287. The reversal of 21021303210223 is 32201230312012.

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

It is a cyclic number.

It is not a de Polignac number, because 21021303210223 - 2³⁷ = 20883864256751 is a prime.

It is a super-2 number, since 2×21021303210223² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021303210194 and 21021303210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021303210293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47181415 + ... + 47624872.

It is an arithmetic number, because the mean of its divisors is an integer number (5255349559560).

Almost surely, 2^{21021303210223} is an apocalyptic number.

21021303210223 is a deficient number, since it is larger than the sum of its proper divisors (95028017).

21021303210223 is an equidigital number, since it uses as much as digits as its factorization.

21021303210223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95028016.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21021303210223 its reverse (32201230312012), we get a palindrome (53222533522235).

The spelling of 21021303210223 in words is "twenty-one trillion, twenty-one billion, three hundred three million, two hundred ten thousand, two hundred twenty-three".