21212130331 has 12 divisors (see below), whose sum is σ = 24694289208. Its totient is φ = 18167860032.

The previous prime is 21212130319. The next prime is 21212130361. The reversal of 21212130331 is 13303121212.

It is not a de Polignac number, because 21212130331 - 2¹¹ = 21212128283 is a prime.

It is a super-2 number, since 2×21212130331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212130299 and 21212130308.

It is not an unprimeable number, because it can be changed into a prime (21212130361) 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, 101566 + ... + 229651.

It is an arithmetic number, because the mean of its divisors is an integer number (2057857434).

Almost surely, 2^21212130331 is an apocalyptic number.

21212130331 is a deficient number, since it is larger than the sum of its proper divisors (3482158877).

21212130331 is a wasteful number, since it uses less digits than its factorization.

21212130331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332538 (or 332531 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21212130331 its reverse (13303121212), we get a palindrome (34515251543).

The spelling of 21212130331 in words is "twenty-one billion, two hundred twelve million, one hundred thirty thousand, three hundred thirty-one".