1321100401 has 4 divisors (see below), whose sum is σ = 1353322404. Its totient is φ = 1288878400.

The previous prime is 1321100399. The next prime is 1321100441. The reversal of 1321100401 is 1040011231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69639025 + 1251461376 = 8345^2 + 35376^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321100401 - 2¹ = 1321100399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321100441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16110940 + ... + 16111021.

It is an arithmetic number, because the mean of its divisors is an integer number (338330601).

Almost surely, 2^1321100401 is an apocalyptic number.

It is an amenable number.

1321100401 is a deficient number, since it is larger than the sum of its proper divisors (32222003).

1321100401 is an equidigital number, since it uses as much as digits as its factorization.

1321100401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32222002.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1321100401 is about 36346.9448647338. The cubic root of 1321100401 is about 1097.2660483782.

Adding to 1321100401 its reverse (1040011231), we get a palindrome (2361111632).

The spelling of 1321100401 in words is "one billion, three hundred twenty-one million, one hundred thousand, four hundred one".