21312031203301 has 4 divisors (see below), whose sum is σ = 21318859797004. Its totient is φ = 21305202609600.

The previous prime is 21312031203299. The next prime is 21312031203319. The reversal of 21312031203301 is 10330213021312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7646248084225 + 13665783119076 = 2765185^2 + 3696726^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312031203301 - 2¹ = 21312031203299 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 (21312031213301) 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, 3414292170 + ... + 3414298411.

It is an arithmetic number, because the mean of its divisors is an integer number (5329714949251).

Almost surely, 2^{21312031203301} is an apocalyptic number.

It is an amenable number.

21312031203301 is a deficient number, since it is larger than the sum of its proper divisors (6828593703).

21312031203301 is an equidigital number, since it uses as much as digits as its factorization.

21312031203301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6828593702.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21312031203301 its reverse (10330213021312), we get a palindrome (31642244224613).

The spelling of 21312031203301 in words is "twenty-one trillion, three hundred twelve billion, thirty-one million, two hundred three thousand, three hundred one".