21312221321323 has 8 divisors (see below), whose sum is σ = 22467054442320. Its totient is φ = 20160701926560.

The previous prime is 21312221321273. The next prime is 21312221321327. The reversal of 21312221321323 is 32312312221312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21312221321323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312221321291 and 21312221321300.

It is not an unprimeable number, because it can be changed into a prime (21312221321327) 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, 828418348 + ... + 828444073.

It is an arithmetic number, because the mean of its divisors is an integer number (2808381805290).

Almost surely, 2^{21312221321323} is an apocalyptic number.

21312221321323 is a deficient number, since it is larger than the sum of its proper divisors (1154833120997).

21312221321323 is a wasteful number, since it uses less digits than its factorization.

21312221321323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656863117.

The product of its digits is 5184, while the sum is 28.

Adding to 21312221321323 its reverse (32312312221312), we get a palindrome (53624533542635).

The spelling of 21312221321323 in words is "twenty-one trillion, three hundred twelve billion, two hundred twenty-one million, three hundred twenty-one thousand, three hundred twenty-three".