21212113330 has 16 divisors (see below), whose sum is σ = 38198642904. Its totient is φ = 8481103360.

The previous prime is 21212113327. The next prime is 21212113333. The reversal of 21212113330 is 3331121212.

It is an interprime number because it is at equal distance from previous prime (21212113327) and next prime (21212113333).

It can be written as a sum of positive squares in 4 ways, for example, as 19844075161 + 1368038169 = 140869^2 + 36987^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21212113298 and 21212113307.

It is not an unprimeable number, because it can be changed into a prime (21212113333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443881 + ... + 489340.

Almost surely, 2^21212113330 is an apocalyptic number.

21212113330 is a deficient number, since it is larger than the sum of its proper divisors (16986529574).

21212113330 is a wasteful number, since it uses less digits than its factorization.

21212113330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935501.

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

Adding to 21212113330 its reverse (3331121212), we get a palindrome (24543234542).

The spelling of 21212113330 in words is "twenty-one billion, two hundred twelve million, one hundred thirteen thousand, three hundred thirty".