1311023032021 has 4 divisors (see below), whose sum is σ = 1311033421152. Its totient is φ = 1311012642892.

The previous prime is 1311023031991. The next prime is 1311023032027. The reversal of 1311023032021 is 1202303201131.

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 1311023032021 - 2⁷ = 1311023031893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311023032021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311023032027) 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, 5002921 + ... + 5258446.

It is an arithmetic number, because the mean of its divisors is an integer number (327758355288).

Almost surely, 2^{1311023032021} is an apocalyptic number.

It is an amenable number.

1311023032021 is a deficient number, since it is larger than the sum of its proper divisors (10389131).

1311023032021 is a wasteful number, since it uses less digits than its factorization.

1311023032021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10389130.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1311023032021 its reverse (1202303201131), we get a palindrome (2513326233152).

The spelling of 1311023032021 in words is "one trillion, three hundred eleven billion, twenty-three million, thirty-two thousand, twenty-one".