21311302233013 has 6 divisors (see below), whose sum is σ = 23076735554274. Its totient is φ = 19671971291856.

The previous prime is 21311302232977. The next prime is 21311302233061. The reversal of 21311302233013 is 31033220311312.

It can be written as a sum of positive squares in 3 ways, for example, as 2430035146449 + 18881267086564 = 1558857^2 + 4345258^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21311302233013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311302233073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63051189870 + ... + 63051190207.

It is an arithmetic number, because the mean of its divisors is an integer number (3846122592379).

Almost surely, 2^{21311302233013} is an apocalyptic number.

It is an amenable number.

21311302233013 is a deficient number, since it is larger than the sum of its proper divisors (1765433321261).

21311302233013 is a wasteful number, since it uses less digits than its factorization.

21311302233013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126102380103 (or 126102380090 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21311302233013 its reverse (31033220311312), we get a palindrome (52344522544325).

The spelling of 21311302233013 in words is "twenty-one trillion, three hundred eleven billion, three hundred two million, two hundred thirty-three thousand, thirteen".