1321234431401 has 2 divisors, whose sum is σ = 1321234431402. Its totient is φ = 1321234431400.

The previous prime is 1321234431397. The next prime is 1321234431421. The reversal of 1321234431401 is 1041344321231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 967862440000 + 353371991401 = 983800^2 + 594451^2 .

It is an emirp because it is prime and its reverse (1041344321231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321234431401 - 2² = 1321234431397 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321234431421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660617215700 + 660617215701.

It is an arithmetic number, because the mean of its divisors is an integer number (660617215701).

Almost surely, 2^{1321234431401} is an apocalyptic number.

It is an amenable number.

1321234431401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321234431401 is an equidigital number, since it uses as much as digits as its factorization.

1321234431401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 1321234431401 its reverse (1041344321231), we get a palindrome (2362578752632).

The spelling of 1321234431401 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-four million, four hundred thirty-one thousand, four hundred one".