111221002120 has 32 divisors (see below), whose sum is σ = 250298184600. Its totient is φ = 44479346688.

The previous prime is 111221002117. The next prime is 111221002121. The reversal of 111221002120 is 21200122111.

It can be written as a sum of positive squares in 4 ways, for example, as 109596750916 + 1624251204 = 331054^2 + 40302^2 .

It is a super-2 number, since 2×111221002120² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111221002120.

It is not an unprimeable number, because it can be changed into a prime (111221002121) 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, 82185 + ... + 478744.

Almost surely, 2^111221002120 is an apocalyptic number.

111221002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221002120 is an abundant number, since it is smaller than the sum of its proper divisors (139077182480).

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

111221002120 is a wasteful number, since it uses less digits than its factorization.

111221002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565897 (or 565893 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111221002120 its reverse (21200122111), we get a palindrome (132421124231).

The spelling of 111221002120 in words is "one hundred eleven billion, two hundred twenty-one million, two thousand, one hundred twenty".