111221221000 has 32 divisors (see below), whose sum is σ = 260257659480. Its totient is φ = 44488488000.

The previous prime is 111221220983. The next prime is 111221221021. The reversal of 111221221000 is 122122111.

It can be written as a sum of positive squares in 4 ways, for example, as 29561300356 + 81659920644 = 171934^2 + 285762^2 .

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, 55609611 + ... + 55611610.

Almost surely, 2^111221221000 is an apocalyptic number.

111221221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221221000 is an abundant number, since it is smaller than the sum of its proper divisors (149036438480).

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

111221221000 is a wasteful number, since it uses less digits than its factorization.

111221221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111221242 (or 111221228 counting only the distinct ones).

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

Adding to 111221221000 its reverse (122122111), we get a palindrome (111343343111).

The spelling of 111221221000 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand".