1311421603021 has 4 divisors (see below), whose sum is σ = 1314254047552. Its totient is φ = 1308589158492.

The previous prime is 1311421603003. The next prime is 1311421603031. The reversal of 1311421603021 is 1203061241131.

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 a cyclic number.

It is not a de Polignac number, because 1311421603021 - 2⁹ = 1311421602509 is a prime.

It is a super-3 number, since 3×1311421603021³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311421603031) 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, 1416221571 + ... + 1416222496.

It is an arithmetic number, because the mean of its divisors is an integer number (328563511888).

Almost surely, 2^{1311421603021} is an apocalyptic number.

It is an amenable number.

1311421603021 is a deficient number, since it is larger than the sum of its proper divisors (2832444531).

1311421603021 is an equidigital number, since it uses as much as digits as its factorization.

1311421603021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832444530.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 1311421603021 its reverse (1203061241131), we get a palindrome (2514482844152).

The spelling of 1311421603021 in words is "one trillion, three hundred eleven billion, four hundred twenty-one million, six hundred three thousand, twenty-one".