111222021220 has 24 divisors (see below), whose sum is σ = 233658198144. Its totient is φ = 44471293536.

The previous prime is 111222021199. The next prime is 111222021223. The reversal of 111222021220 is 22120222111.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 111222021194 and 111222021203.

It is not an unprimeable number, because it can be changed into a prime (111222021223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1042554 + ... + 1144273.

It is an arithmetic number, because the mean of its divisors is an integer number (9735758256).

Almost surely, 2^111222021220 is an apocalyptic number.

111222021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111222021220 is an abundant number, since it is smaller than the sum of its proper divisors (122436176924).

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

111222021220 is a wasteful number, since it uses less digits than its factorization.

111222021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189379 (or 2189377 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 111222021220 its reverse (22120222111), we get a palindrome (133342243331).

The spelling of 111222021220 in words is "one hundred eleven billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty".