21030303213 has 20 divisors (see below), whose sum is σ = 31422035040. Its totient is φ = 14017347432.

The previous prime is 21030303199. The next prime is 21030303221. The reversal of 21030303213 is 31230303012.

It is not a de Polignac number, because 21030303213 - 2¹² = 21030299117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030303223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 420106 + ... + 467492.

It is an arithmetic number, because the mean of its divisors is an integer number (1571101752).

Almost surely, 2^21030303213 is an apocalyptic number.

It is an amenable number.

21030303213 is a deficient number, since it is larger than the sum of its proper divisors (10391731827).

21030303213 is an equidigital number, since it uses as much as digits as its factorization.

21030303213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52878 (or 52869 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21030303213 its reverse (31230303012), we get a palindrome (52260606225).

The spelling of 21030303213 in words is "twenty-one billion, thirty million, three hundred three thousand, two hundred thirteen".