1321023400401 has 4 divisors (see below), whose sum is σ = 1761364533872. Its totient is φ = 880682266932.

The previous prime is 1321023400397. The next prime is 1321023400423. The reversal of 1321023400401 is 1040043201231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1321023400401 - 2² = 1321023400397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321023400451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220170566731 + ... + 220170566736.

It is an arithmetic number, because the mean of its divisors is an integer number (440341133468).

Almost surely, 2^{1321023400401} is an apocalyptic number.

It is an amenable number.

1321023400401 is a deficient number, since it is larger than the sum of its proper divisors (440341133471).

1321023400401 is an equidigital number, since it uses as much as digits as its factorization.

1321023400401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440341133470.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1321023400401 its reverse (1040043201231), we get a palindrome (2361066601632).

The spelling of 1321023400401 in words is "one trillion, three hundred twenty-one billion, twenty-three million, four hundred thousand, four hundred one".