1221444321 has 8 divisors (see below), whose sum is σ = 1628758560. Its totient is φ = 814213152.

The previous prime is 1221444293. The next prime is 1221444331. The reversal of 1221444321 is 1234441221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221444321 - 2⁷ = 1221444193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221444291 and 1221444300.

It is not an unprimeable number, because it can be changed into a prime (1221444331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34741 + ... + 60413.

It is an arithmetic number, because the mean of its divisors is an integer number (203594820).

Almost surely, 2^1221444321 is an apocalyptic number.

It is an amenable number.

1221444321 is a deficient number, since it is larger than the sum of its proper divisors (407314239).

1221444321 is a wasteful number, since it uses less digits than its factorization.

1221444321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41535.

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

The square root of 1221444321 is about 34949.1676724926. The cubic root of 1221444321 is about 1068.9512305059.

Adding to 1221444321 its reverse (1234441221), we get a palindrome (2455885542).

The spelling of 1221444321 in words is "one billion, two hundred twenty-one million, four hundred forty-four thousand, three hundred twenty-one".