111221211210 has 16 divisors (see below), whose sum is σ = 266930906976. Its totient is φ = 29658989648.

The previous prime is 111221211209. The next prime is 111221211253. The reversal of 111221211210 is 12112122111.

It is a happy number.

It is a super-3 number, since 3×111221211210³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 111221211210.

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, 1853686824 + ... + 1853686883.

It is an arithmetic number, because the mean of its divisors is an integer number (16683181686).

Almost surely, 2^111221211210 is an apocalyptic number.

111221211210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111221211210 is an abundant number, since it is smaller than the sum of its proper divisors (155709695766).

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

111221211210 is a wasteful number, since it uses less digits than its factorization.

111221211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707373717.

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

Adding to 111221211210 its reverse (12112122111), we get a palindrome (123333333321).

The spelling of 111221211210 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred ten".