21313113333321 has 4 divisors (see below), whose sum is σ = 28417484444432. Its totient is φ = 14208742222212.

The previous prime is 21313113333313. The next prime is 21313113333331. The reversal of 21313113333321 is 12333331131312.

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 not a de Polignac number, because 21313113333321 - 2³ = 21313113333313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313113333331) 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, 3552185555551 + ... + 3552185555556.

It is an arithmetic number, because the mean of its divisors is an integer number (7104371111108).

Almost surely, 2^{21313113333321} is an apocalyptic number.

It is an amenable number.

21313113333321 is a deficient number, since it is larger than the sum of its proper divisors (7104371111111).

21313113333321 is an equidigital number, since it uses as much as digits as its factorization.

21313113333321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104371111110.

The product of its digits is 8748, while the sum is 30.

Adding to 21313113333321 its reverse (12333331131312), we get a palindrome (33646444464633).

The spelling of 21313113333321 in words is "twenty-one trillion, three hundred thirteen billion, one hundred thirteen million, three hundred thirty-three thousand, three hundred twenty-one".