1221241344 has 40 divisors (see below), whose sum is σ = 3253467360. Its totient is φ = 407079936.

The previous prime is 1221241339. The next prime is 1221241363. The reversal of 1221241344 is 4431421221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396004 + ... + 399075.

It is an arithmetic number, because the mean of its divisors is an integer number (81336684).

Almost surely, 2^1221241344 is an apocalyptic number.

It is an amenable number.

1221241344 is an abundant number, since it is smaller than the sum of its proper divisors (2032226016).

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

1221241344 is an frugal number, since it uses more digits than its factorization.

1221241344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795100 (or 795084 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 1221241344 is about 34946.2636629440. The cubic root of 1221241344 is about 1068.8920152173.

Adding to 1221241344 its reverse (4431421221), we get a palindrome (5652662565).

The spelling of 1221241344 in words is "one billion, two hundred twenty-one million, two hundred forty-one thousand, three hundred forty-four".