1321203241403 has 4 divisors (see below), whose sum is σ = 1321304040480. Its totient is φ = 1321102442328.

The previous prime is 1321203241399. The next prime is 1321203241409. The reversal of 1321203241403 is 3041423021231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321203241403 - 2² = 1321203241399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321203241409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50379875 + ... + 50406092.

It is an arithmetic number, because the mean of its divisors is an integer number (330326010120).

Almost surely, 2^{1321203241403} is an apocalyptic number.

1321203241403 is a deficient number, since it is larger than the sum of its proper divisors (100799077).

1321203241403 is a wasteful number, since it uses less digits than its factorization.

1321203241403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100799076.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 1321203241403 its reverse (3041423021231), we get a palindrome (4362626262634).

The spelling of 1321203241403 in words is "one trillion, three hundred twenty-one billion, two hundred three million, two hundred forty-one thousand, four hundred three".