111212220111 has 16 divisors (see below), whose sum is σ = 149480592000. Its totient is φ = 73544014368.

The previous prime is 111212220071. The next prime is 111212220113. The reversal of 111212220111 is 111022212111.

It is a happy number.

It is not a de Polignac number, because 111212220111 - 2¹¹ = 111212218063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212220113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162000 + ... + 498666.

It is an arithmetic number, because the mean of its divisors is an integer number (9342537000).

Almost surely, 2^111212220111 is an apocalyptic number.

111212220111 is a deficient number, since it is larger than the sum of its proper divisors (38268371889).

111212220111 is a wasteful number, since it uses less digits than its factorization.

111212220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337558.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111212220111 its reverse (111022212111), we get a palindrome (222234432222).

The spelling of 111212220111 in words is "one hundred eleven billion, two hundred twelve million, two hundred twenty thousand, one hundred eleven".