1320125221 has 4 divisors (see below), whose sum is σ = 1320199852. Its totient is φ = 1320050592.

The previous prime is 1320125207. The next prime is 1320125243. The reversal of 1320125221 is 1225210231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 708304996 + 611820225 = 26614^2 + 24735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320125221 - 2⁵ = 1320125189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320125251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5905 + ... + 51721.

It is an arithmetic number, because the mean of its divisors is an integer number (330049963).

Almost surely, 2^1320125221 is an apocalyptic number.

It is an amenable number.

1320125221 is a deficient number, since it is larger than the sum of its proper divisors (74631).

1320125221 is an equidigital number, since it uses as much as digits as its factorization.

1320125221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74630.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1320125221 is about 36333.5275055974. The cubic root of 1320125221 is about 1096.9959969130.

Adding to 1320125221 its reverse (1225210231), we get a palindrome (2545335452).

The spelling of 1320125221 in words is "one billion, three hundred twenty million, one hundred twenty-five thousand, two hundred twenty-one".