1320221121 has 8 divisors (see below), whose sum is σ = 1762111584. Its totient is φ = 879239040.

The previous prime is 1320221083. The next prime is 1320221129. The reversal of 1320221121 is 1211220231.

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

It is not a de Polignac number, because 1320221121 - 2¹⁴ = 1320204737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320221121.

It is not an unprimeable number, because it can be changed into a prime (1320221129) 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, 223696 + ... + 229521.

It is an arithmetic number, because the mean of its divisors is an integer number (220263948).

Almost surely, 2^1320221121 is an apocalyptic number.

It is an amenable number.

1320221121 is a deficient number, since it is larger than the sum of its proper divisors (441890463).

1320221121 is an equidigital number, since it uses as much as digits as its factorization.

1320221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454191.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1320221121 is about 36334.8471993485. The cubic root of 1320221121 is about 1097.0225598903.

Adding to 1320221121 its reverse (1211220231), we get a palindrome (2531441352).

The spelling of 1320221121 in words is "one billion, three hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".