1321023052403 has 2 divisors, whose sum is σ = 1321023052404. Its totient is φ = 1321023052402.

The previous prime is 1321023052397. The next prime is 1321023052439. The reversal of 1321023052403 is 3042503201231.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321023052403 - 2²⁴ = 1321006275187 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1321023052903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660511526201 + 660511526202.

It is an arithmetic number, because the mean of its divisors is an integer number (660511526202).

Almost surely, 2^{1321023052403} is an apocalyptic number.

1321023052403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321023052403 is an equidigital number, since it uses as much as digits as its factorization.

1321023052403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 1321023052403 its reverse (3042503201231), we get a palindrome (4363526253634).

The spelling of 1321023052403 in words is "one trillion, three hundred twenty-one billion, twenty-three million, fifty-two thousand, four hundred three".