21212002303 has 2 divisors, whose sum is σ = 21212002304. Its totient is φ = 21212002302.

The previous prime is 21212002289. The next prime is 21212002307. The reversal of 21212002303 is 30320021212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212002303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212002307) 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 as a sum of consecutive naturals, namely, 10606001151 + 10606001152.

It is an arithmetic number, because the mean of its divisors is an integer number (10606001152).

Almost surely, 2^21212002303 is an apocalyptic number.

21212002303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212002303 is an equidigital number, since it uses as much as digits as its factorization.

21212002303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21212002303 its reverse (30320021212), we get a palindrome (51532023515).

The spelling of 21212002303 in words is "twenty-one billion, two hundred twelve million, two thousand, three hundred three".