211111021121212 has 24 divisors (see below), whose sum is σ = 370123791317280. Its totient is φ = 105361531906560.

The previous prime is 211111021121177. The next prime is 211111021121237. The reversal of 211111021121212 is 212121120111112.

It is a self number, because there is not a number n which added to its sum of digits gives 211111021121212.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15575464 + ... + 25784047.

It is an arithmetic number, because the mean of its divisors is an integer number (15421824638220).

Almost surely, 2^{211111021121212} is an apocalyptic number.

It is an amenable number.

211111021121212 is a deficient number, since it is larger than the sum of its proper divisors (159012770196068).

211111021121212 is a wasteful number, since it uses less digits than its factorization.

211111021121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41361861 (or 41361859 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211111021121212 its reverse (212121120111112), we get a palindrome (423232141232324).

The spelling of 211111021121212 in words is "two hundred eleven trillion, one hundred eleven billion, twenty-one million, one hundred twenty-one thousand, two hundred twelve".