12211112212 has 24 divisors (see below), whose sum is σ = 23271834600. Its totient is φ = 5572571136.

The previous prime is 12211112203. The next prime is 12211112213. The reversal of 12211112212 is 21221111221.

It can be written as a sum of positive squares in 4 ways, for example, as 435389956 + 11775722256 = 20866^2 + 108516^2 .

It is a super-2 number, since 2×12211112212² (a number of 21 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 not an unprimeable number, because it can be changed into a prime (12211112213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1314637 + ... + 1323892.

It is an arithmetic number, because the mean of its divisors is an integer number (969659775).

Almost surely, 2^12211112212 is an apocalyptic number.

It is an amenable number.

12211112212 is a deficient number, since it is larger than the sum of its proper divisors (11060722388).

12211112212 is a wasteful number, since it uses less digits than its factorization.

12211112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638635 (or 2638633 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

Adding to 12211112212 its reverse (21221111221), we get a palindrome (33432223433).

Subtracting 12211112212 from its reverse (21221111221), we obtain a palindrome (9009999009).

It can be divided in two parts, 1221111221 and 2, that multiplied together give a palindrome (2442222442).

The spelling of 12211112212 in words is "twelve billion, two hundred eleven million, one hundred twelve thousand, two hundred twelve".