21212003321023 has 4 divisors (see below), whose sum is σ = 21212012541160. Its totient is φ = 21211994100888.

The previous prime is 21212003321017. The next prime is 21212003321039. The reversal of 21212003321023 is 32012330021212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212003321023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212003320985 and 21212003321003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212003321053) 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, 2002333 + ... + 6814201.

It is an arithmetic number, because the mean of its divisors is an integer number (5303003135290).

Almost surely, 2^{21212003321023} is an apocalyptic number.

21212003321023 is a deficient number, since it is larger than the sum of its proper divisors (9220137).

21212003321023 is an equidigital number, since it uses as much as digits as its factorization.

21212003321023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220136.

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

Adding to 21212003321023 its reverse (32012330021212), we get a palindrome (53224333342235).

The spelling of 21212003321023 in words is "twenty-one trillion, two hundred twelve billion, three million, three hundred twenty-one thousand, twenty-three".