21212102212 has 24 divisors (see below), whose sum is σ = 42427457856. Its totient is φ = 9090203808.

The previous prime is 21212102201. The next prime is 21212102237. The reversal of 21212102212 is 21220121212.

It is a happy number.

It is a super-3 number, since 3×21212102212³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534198 + ... + 572530.

It is an arithmetic number, because the mean of its divisors is an integer number (1767810744).

Almost surely, 2^21212102212 is an apocalyptic number.

It is an amenable number.

21212102212 is an abundant number, since it is smaller than the sum of its proper divisors (21215355644).

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

21212102212 is a wasteful number, since it uses less digits than its factorization.

21212102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58107 (or 58105 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212102212 its reverse (21220121212), we get a palindrome (42432223424).

The spelling of 21212102212 in words is "twenty-one billion, two hundred twelve million, one hundred two thousand, two hundred twelve".