111212011220 has 48 divisors (see below), whose sum is σ = 234431417808. Its totient is φ = 44316180480.

The previous prime is 111212011217. The next prime is 111212011241. The reversal of 111212011220 is 22110212111.

It can be written as a sum of positive squares in 8 ways, for example, as 7694096656 + 103517914564 = 87716^2 + 321742^2 .

It is a super-2 number, since 2×111212011220² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111212011195 and 111212011204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13022792 + ... + 13031328.

It is an arithmetic number, because the mean of its divisors is an integer number (4883987871).

Almost surely, 2^111212011220 is an apocalyptic number.

111212011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212011220 is an abundant number, since it is smaller than the sum of its proper divisors (123219406588).

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

111212011220 is a wasteful number, since it uses less digits than its factorization.

111212011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10940 (or 10938 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111212011220 its reverse (22110212111), we get a palindrome (133322223331).

The spelling of 111212011220 in words is "one hundred eleven billion, two hundred twelve million, eleven thousand, two hundred twenty".