21221030333 has 4 divisors (see below), whose sum is σ = 21316192128. Its totient is φ = 21125868540.

The previous prime is 21221030287. The next prime is 21221030371. The reversal of 21221030333 is 33303012212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21221030333 - 2⁶ = 21221030269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221032333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47580563 + ... + 47581008.

It is an arithmetic number, because the mean of its divisors is an integer number (5329048032).

Almost surely, 2^21221030333 is an apocalyptic number.

It is an amenable number.

21221030333 is a deficient number, since it is larger than the sum of its proper divisors (95161795).

21221030333 is an equidigital number, since it uses as much as digits as its factorization.

21221030333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95161794.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21221030333 its reverse (33303012212), we get a palindrome (54524042545).

The spelling of 21221030333 in words is "twenty-one billion, two hundred twenty-one million, thirty thousand, three hundred thirty-three".