21333103221 has 64 divisors (see below), whose sum is σ = 31377715200. Its totient is φ = 12849897984.

The previous prime is 21333103219. The next prime is 21333103223. The reversal of 21333103221 is 12230133312.

It is an interprime number because it is at equal distance from previous prime (21333103219) and next prime (21333103223).

It is not a de Polignac number, because 21333103221 - 2¹ = 21333103219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333103223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18342586 + ... + 18343748.

It is an arithmetic number, because the mean of its divisors is an integer number (490276800).

Almost surely, 2^21333103221 is an apocalyptic number.

It is an amenable number.

21333103221 is a deficient number, since it is larger than the sum of its proper divisors (10044611979).

21333103221 is a wasteful number, since it uses less digits than its factorization.

21333103221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21333103221 its reverse (12230133312), we get a palindrome (33563236533).

The spelling of 21333103221 in words is "twenty-one billion, three hundred thirty-three million, one hundred three thousand, two hundred twenty-one".