1320100321 has 2 divisors, whose sum is σ = 1320100322. Its totient is φ = 1320100320.

The previous prime is 1320100283. The next prime is 1320100343. The reversal of 1320100321 is 1230010231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1271992225 + 48108096 = 35665^2 + 6936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320100321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320100361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660050160 + 660050161.

It is an arithmetic number, because the mean of its divisors is an integer number (660050161).

Almost surely, 2^1320100321 is an apocalyptic number.

It is an amenable number.

1320100321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320100321 is an equidigital number, since it uses as much as digits as its factorization.

1320100321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1320100321 is about 36333.1848452623. The cubic root of 1320100321 is about 1096.9890997461.

Adding to 1320100321 its reverse (1230010231), we get a palindrome (2550110552).

The spelling of 1320100321 in words is "one billion, three hundred twenty million, one hundred thousand, three hundred twenty-one".