111221021210 has 16 divisors (see below), whose sum is σ = 215597672136. Its totient is φ = 41066223168.

The previous prime is 111221021167. The next prime is 111221021227. The reversal of 111221021210 is 12120122111.

It can be written as a sum of positive squares in 4 ways, for example, as 47413756009 + 63807265201 = 217747^2 + 252601^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427773029 + ... + 427773288.

Almost surely, 2^111221021210 is an apocalyptic number.

111221021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111221021210 is a deficient number, since it is larger than the sum of its proper divisors (104376650926).

111221021210 is a wasteful number, since it uses less digits than its factorization.

111221021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855546337.

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

Adding to 111221021210 its reverse (12120122111), we get a palindrome (123341143321).

The spelling of 111221021210 in words is "one hundred eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred ten".