1221044000 has 96 divisors (see below), whose sum is σ = 3272959872. Its totient is φ = 444000000.

The previous prime is 1221043991. The next prime is 1221044003. The reversal of 1221044000 is 4401221.

It is not an unprimeable number, because it can be changed into a prime (1221044003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30125 + ... + 57875.

It is an arithmetic number, because the mean of its divisors is an integer number (34093332).

Almost surely, 2^1221044000 is an apocalyptic number.

1221044000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221044000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1636479936).

1221044000 is an abundant number, since it is smaller than the sum of its proper divisors (2051915872).

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

1221044000 is a wasteful number, since it uses less digits than its factorization.

1221044000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27787 (or 27769 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1221044000 is about 34943.4400138281. The cubic root of 1221044000 is about 1068.8344369753.

Adding to 1221044000 its reverse (4401221), we get a palindrome (1225445221).

It can be divided in two parts, 12 and 21044000, that added together give a palindrome (21044012).

The spelling of 1221044000 in words is "one billion, two hundred twenty-one million, forty-four thousand".