111211021212 has 96 divisors (see below), whose sum is σ = 274025385984. Its totient is φ = 35057318400.

The previous prime is 111211021157. The next prime is 111211021261. The reversal of 111211021212 is 212120112111.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 111211021191 and 111211021200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4922013 + ... + 4944555.

It is an arithmetic number, because the mean of its divisors is an integer number (2854431104).

Almost surely, 2^111211021212 is an apocalyptic number.

111211021212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111211021212 is an abundant number, since it is smaller than the sum of its proper divisors (162814364772).

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

111211021212 is a wasteful number, since it uses less digits than its factorization.

111211021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22899 (or 22897 counting only the distinct ones).

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

Adding to 111211021212 its reverse (212120112111), we get a palindrome (323331133323).

The spelling of 111211021212 in words is "one hundred eleven billion, two hundred eleven million, twenty-one thousand, two hundred twelve".