111121021212 has 24 divisors (see below), whose sum is σ = 260730892800. Its totient is φ = 36833410416.

The previous prime is 111121021189. The next prime is 111121021229. The reversal of 111121021212 is 212120121111.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 111121021191 and 111121021200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25864012 + ... + 25868307.

It is an arithmetic number, because the mean of its divisors is an integer number (10863787200).

Almost surely, 2^111121021212 is an apocalyptic number.

111121021212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111121021212 is an abundant number, since it is smaller than the sum of its proper divisors (149609871588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111121021212 is a wasteful number, since it uses less digits than its factorization.

111121021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51732505 (or 51732503 counting only the distinct ones).

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

Adding to 111121021212 its reverse (212120121111), we get a palindrome (323241142323).

The spelling of 111121021212 in words is "one hundred eleven billion, one hundred twenty-one million, twenty-one thousand, two hundred twelve".