21212301303 has 32 divisors (see below), whose sum is σ = 31834682880. Its totient is φ = 14132166552.

The previous prime is 21212301289. The next prime is 21212301389. The reversal of 21212301303 is 30310321212.

It is not a de Polignac number, because 21212301303 - 2³⁰ = 20138559479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212301203) 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 31 ways as a sum of consecutive naturals, for example, 5297100 + ... + 5301102.

It is an arithmetic number, because the mean of its divisors is an integer number (994833840).

Almost surely, 2^21212301303 is an apocalyptic number.

21212301303 is a deficient number, since it is larger than the sum of its proper divisors (10622381577).

21212301303 is an frugal number, since it uses more digits than its factorization.

21212301303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6447 (or 6429 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21212301303 its reverse (30310321212), we get a palindrome (51522622515).

The spelling of 21212301303 in words is "twenty-one billion, two hundred twelve million, three hundred one thousand, three hundred three".