21211003331 has 12 divisors (see below), whose sum is σ = 24971306472. Its totient is φ = 17961810048.

The previous prime is 21211003291. The next prime is 21211003369. The reversal of 21211003331 is 13330011212.

It is a de Polignac number, because none of the positive numbers 2^k-21211003331 is a prime.

It is a super-2 number, since 2×21211003331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21211003391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2603630 + ... + 2611763.

It is an arithmetic number, because the mean of its divisors is an integer number (2080942206).

Almost surely, 2^21211003331 is an apocalyptic number.

21211003331 is a deficient number, since it is larger than the sum of its proper divisors (3760303141).

21211003331 is an equidigital number, since it uses as much as digits as its factorization.

21211003331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5215490 (or 5215483 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21211003331 its reverse (13330011212), we get a palindrome (34541014543).

The spelling of 21211003331 in words is "twenty-one billion, two hundred eleven million, three thousand, three hundred thirty-one".