21021201303 has 4 divisors (see below), whose sum is σ = 28028268408. Its totient is φ = 14014134200.

The previous prime is 21021201287. The next prime is 21021201317. The reversal of 21021201303 is 30310212012.

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 21021201303 - 2⁴ = 21021201287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021201343) 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 3 ways as a sum of consecutive naturals, for example, 3503533548 + ... + 3503533553.

It is an arithmetic number, because the mean of its divisors is an integer number (7007067102).

Almost surely, 2^21021201303 is an apocalyptic number.

21021201303 is a deficient number, since it is larger than the sum of its proper divisors (7007067105).

21021201303 is an equidigital number, since it uses as much as digits as its factorization.

21021201303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007067104.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21021201303 its reverse (30310212012), we get a palindrome (51331413315).

The spelling of 21021201303 in words is "twenty-one billion, twenty-one million, two hundred one thousand, three hundred three".