21312020313233 has 8 divisors (see below), whose sum is σ = 22951529294568. Its totient is φ = 19672528875264.

The previous prime is 21312020313169. The next prime is 21312020313329. The reversal of 21312020313233 is 33231302021312.

It can be written as a sum of positive squares in 4 ways, for example, as 736932968704 + 20575087344529 = 858448^2 + 4535977^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21312020313233 - 2⁶ = 21312020313169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312020313833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1806566 + ... + 6774047.

It is an arithmetic number, because the mean of its divisors is an integer number (2868941161821).

Almost surely, 2^{21312020313233} is an apocalyptic number.

It is an amenable number.

21312020313233 is a deficient number, since it is larger than the sum of its proper divisors (1639508981335).

21312020313233 is a wasteful number, since it uses less digits than its factorization.

21312020313233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8771683.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21312020313233 its reverse (33231302021312), we get a palindrome (54543322334545).

The spelling of 21312020313233 in words is "twenty-one trillion, three hundred twelve billion, twenty million, three hundred thirteen thousand, two hundred thirty-three".