21030221303 has 16 divisors (see below), whose sum is σ = 25887301440. Its totient is φ = 16636755456.

The previous prime is 21030221293. The next prime is 21030221309. The reversal of 21030221303 is 30312203012.

It is a cyclic number.

It is not a de Polignac number, because 21030221303 - 2⁴ = 21030221287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030221309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777401 + ... + 803997.

It is an arithmetic number, because the mean of its divisors is an integer number (1617956340).

Almost surely, 2^21030221303 is an apocalyptic number.

21030221303 is a deficient number, since it is larger than the sum of its proper divisors (4857080137).

21030221303 is a wasteful number, since it uses less digits than its factorization.

21030221303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35306.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21030221303 its reverse (30312203012), we get a palindrome (51342424315).

The spelling of 21030221303 in words is "twenty-one billion, thirty million, two hundred twenty-one thousand, three hundred three".