1321400401 has 2 divisors, whose sum is σ = 1321400402. Its totient is φ = 1321400400.

The previous prime is 1321400323. The next prime is 1321400477. The reversal of 1321400401 is 1040041231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1315948176 + 5452225 = 36276^2 + 2335^2 .

It is an emirp because it is prime and its reverse (1040041231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321400401 - 2¹⁵ = 1321367633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321400491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660700200 + 660700201.

It is an arithmetic number, because the mean of its divisors is an integer number (660700201).

Almost surely, 2^1321400401 is an apocalyptic number.

It is an amenable number.

1321400401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321400401 is an equidigital number, since it uses as much as digits as its factorization.

1321400401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1321400401 is about 36351.0715247845. The cubic root of 1321400401 is about 1097.3490990685.

Adding to 1321400401 its reverse (1040041231), we get a palindrome (2361441632).

The spelling of 1321400401 in words is "one billion, three hundred twenty-one million, four hundred thousand, four hundred one".