21212211212212 has 12 divisors (see below), whose sum is σ = 37122078532896. Its totient is φ = 10605903059960.

The previous prime is 21212211212207. The next prime is 21212211212221. The reversal of 21212211212212 is 21221211221212.

It is a super-2 number, since 2×21212211212212² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50400778 + ... + 50819905.

It is an arithmetic number, because the mean of its divisors is an integer number (3093506544408).

Almost surely, 2^{21212211212212} is an apocalyptic number.

It is an amenable number.

21212211212212 is a deficient number, since it is larger than the sum of its proper divisors (15909867320684).

21212211212212 is a wasteful number, since it uses less digits than its factorization.

21212211212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101273078 (or 101273076 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

Adding to 21212211212212 its reverse (21221211221212), we get a palindrome (42433422433424).

The spelling of 21212211212212 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, two hundred twelve thousand, two hundred twelve".