111212120001212 has 48 divisors (see below), whose sum is σ = 216917024163840. Its totient is φ = 49580236991232.

The previous prime is 111212120001179. The next prime is 111212120001247. The reversal of 111212120001212 is 212100021212111.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 15 ways as a sum of consecutive naturals, for example, 209844263 + ... + 210373569.

It is an arithmetic number, because the mean of its divisors is an integer number (4519104670080).

Almost surely, 2^{111212120001212} is an apocalyptic number.

It is an amenable number.

111212120001212 is a deficient number, since it is larger than the sum of its proper divisors (105704904162628).

111212120001212 is a wasteful number, since it uses less digits than its factorization.

111212120001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691970 (or 691968 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111212120001212 its reverse (212100021212111), we get a palindrome (323312141213323).

The spelling of 111212120001212 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty million, one thousand, two hundred twelve".