21213323212 has 12 divisors (see below), whose sum is σ = 37451841336. Its totient is φ = 10512797120.

The previous prime is 21213323179. The next prime is 21213323213. The reversal of 21213323212 is 21232331212.

It is not an unprimeable number, because it can be changed into a prime (21213323213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23465614 + ... + 23466517.

It is an arithmetic number, because the mean of its divisors is an integer number (3120986778).

Almost surely, 2^21213323212 is an apocalyptic number.

It is an amenable number.

21213323212 is a deficient number, since it is larger than the sum of its proper divisors (16238518124).

21213323212 is a wasteful number, since it uses less digits than its factorization.

21213323212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46932248 (or 46932246 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 21213323212 its reverse (21232331212), we get a palindrome (42445654424).

The spelling of 21213323212 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty-three thousand, two hundred twelve".