111212122220 has 48 divisors (see below), whose sum is σ = 234992959488. Its totient is φ = 44209583040.

The previous prime is 111212122199. The next prime is 111212122247. The reversal of 111212122220 is 22221212111.

It is a super-2 number, since 2×111212122220² (a number of 23 digits) contains 22 as substring.

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, 4138949 + ... + 4165731.

It is an arithmetic number, because the mean of its divisors is an integer number (4895686656).

Almost surely, 2^111212122220 is an apocalyptic number.

111212122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212122220 is an abundant number, since it is smaller than the sum of its proper divisors (123780837268).

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

111212122220 is a wasteful number, since it uses less digits than its factorization.

111212122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28070 (or 28068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111212122220 its reverse (22221212111), we get a palindrome (133433334331).

The spelling of 111212122220 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty".