1220321344 has 56 divisors (see below), whose sum is σ = 2647114848. Its totient is φ = 553559040.

The previous prime is 1220321329. The next prime is 1220321357. The reversal of 1220321344 is 4431230221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411772 + ... + 414724.

It is an arithmetic number, because the mean of its divisors is an integer number (47269908).

Almost surely, 2^1220321344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220321344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1323557424).

1220321344 is an abundant number, since it is smaller than the sum of its proper divisors (1426793504).

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

1220321344 is a wasteful number, since it uses less digits than its factorization.

1220321344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563 (or 3553 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1220321344 is about 34933.0981162565. The cubic root of 1220321344 is about 1068.6235376557.

Adding to 1220321344 its reverse (4431230221), we get a palindrome (5651551565).

The spelling of 1220321344 in words is "one billion, two hundred twenty million, three hundred twenty-one thousand, three hundred forty-four".