111212222121111 has 32 divisors (see below), whose sum is σ = 152379864052416. Its totient is φ = 72095387904000.

The previous prime is 111212222121097. The next prime is 111212222121151. The reversal of 111212222121111 is 111121222212111.

It is not a de Polignac number, because 111212222121111 - 2³⁸ = 110937344214167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212222121151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2452773301 + ... + 2452818641.

It is an arithmetic number, because the mean of its divisors is an integer number (4761870751638).

Almost surely, 2^{111212222121111} is an apocalyptic number.

111212222121111 is a deficient number, since it is larger than the sum of its proper divisors (41167641931305).

111212222121111 is a wasteful number, since it uses less digits than its factorization.

111212222121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57843.

The product of its digits is 64, while the sum is 21.

Adding to 111212222121111 its reverse (111121222212111), we get a palindrome (222333444333222).

The spelling of 111212222121111 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".