21212211330 has 48 divisors (see below), whose sum is σ = 55189892160. Its totient is φ = 5652677664.

The previous prime is 21212211299. The next prime is 21212211331. The reversal of 21212211330 is 3311221212.

21212211330 is a `hidden beast` number, since 2 + 121 + 2 + 211 + 330 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21212211331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50539 + ... + 212081.

It is an arithmetic number, because the mean of its divisors is an integer number (1149789420).

Almost surely, 2^21212211330 is an apocalyptic number.

21212211330 is an abundant number, since it is smaller than the sum of its proper divisors (33977680830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212211330 is a wasteful number, since it uses less digits than its factorization.

21212211330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163015 (or 163012 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21212211330 its reverse (3311221212), we get a palindrome (24523432542).

The spelling of 21212211330 in words is "twenty-one billion, two hundred twelve million, two hundred eleven thousand, three hundred thirty".