11221221000 has 128 divisors (see below), whose sum is σ = 38193068160. Its totient is φ = 2720288000.

The previous prime is 11221220999. The next prime is 11221221013. The reversal of 11221221000 is 12212211.

11221221000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 31 ways as a sum of consecutive naturals, for example, 137019 + ... + 203018.

It is an arithmetic number, because the mean of its divisors is an integer number (298383345).

Almost surely, 2^11221221000 is an apocalyptic number.

11221221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221221000 is an abundant number, since it is smaller than the sum of its proper divisors (26971847160).

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

11221221000 is a wasteful number, since it uses less digits than its factorization.

11221221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340072 (or 340058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 11221221000 its reverse (12212211), we get a palindrome (11233433211).

It can be divided in two parts, 11221 and 221000, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 11221221000 in words is "eleven billion, two hundred twenty-one million, two hundred twenty-one thousand".