1320023400221 has 2 divisors, whose sum is σ = 1320023400222. Its totient is φ = 1320023400220.

The previous prime is 1320023400191. The next prime is 1320023400259. The reversal of 1320023400221 is 1220043200231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1045017552121 + 275005848100 = 1022261^2 + 524410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320023400221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320023400193 and 1320023400202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320023400821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660011700110 + 660011700111.

It is an arithmetic number, because the mean of its divisors is an integer number (660011700111).

Almost surely, 2^{1320023400221} is an apocalyptic number.

It is an amenable number.

1320023400221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320023400221 is an equidigital number, since it uses as much as digits as its factorization.

1320023400221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 1320023400221 its reverse (1220043200231), we get a palindrome (2540066600452).

The spelling of 1320023400221 in words is "one trillion, three hundred twenty billion, twenty-three million, four hundred thousand, two hundred twenty-one".