21021330211 has 32 divisors (see below), whose sum is σ = 25275196800. Its totient is φ = 17465011200.

The previous prime is 21021330203. The next prime is 21021330259. The reversal of 21021330211 is 11203312012.

It is not a de Polignac number, because 21021330211 - 2³ = 21021330203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021330271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2203131 + ... + 2212651.

It is an arithmetic number, because the mean of its divisors is an integer number (789849900).

Almost surely, 2^21021330211 is an apocalyptic number.

21021330211 is a deficient number, since it is larger than the sum of its proper divisors (4253866589).

21021330211 is an equidigital number, since it uses as much as digits as its factorization.

21021330211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9740 (or 9726 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21021330211 its reverse (11203312012), we get a palindrome (32224642223).

The spelling of 21021330211 in words is "twenty-one billion, twenty-one million, three hundred thirty thousand, two hundred eleven".