1220442321 has 16 divisors (see below), whose sum is σ = 1877105664. Its totient is φ = 690876624.

The previous prime is 1220442283. The next prime is 1220442331. The reversal of 1220442321 is 1232440221.

1220442321 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1220442321 - 2¹⁰ = 1220441297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1220442331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269325 + ... + 273818.

It is an arithmetic number, because the mean of its divisors is an integer number (117319104).

Almost surely, 2^1220442321 is an apocalyptic number.

It is an amenable number.

1220442321 is a deficient number, since it is larger than the sum of its proper divisors (656663343).

1220442321 is a wasteful number, since it uses less digits than its factorization.

1220442321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543260.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1220442321 is about 34934.8296260337. The cubic root of 1220442321 is about 1068.6588492831.

Adding to 1220442321 its reverse (1232440221), we get a palindrome (2452882542).

The spelling of 1220442321 in words is "one billion, two hundred twenty million, four hundred forty-two thousand, three hundred twenty-one".