21323303213321 has 4 divisors (see below), whose sum is σ = 21323322983172. Its totient is φ = 21323283443472.

The previous prime is 21323303213269. The next prime is 21323303213341. The reversal of 21323303213321 is 12331230332312.

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 18033305806096 + 3289997407225 = 4246564^2 + 1813835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21323303213321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323303213341) 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, 8167610 + ... + 10457363.

It is an arithmetic number, because the mean of its divisors is an integer number (5330830745793).

Almost surely, 2^{21323303213321} is an apocalyptic number.

It is an amenable number.

21323303213321 is a deficient number, since it is larger than the sum of its proper divisors (19769851).

21323303213321 is a wasteful number, since it uses less digits than its factorization.

21323303213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19769850.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 21323303213321 its reverse (12331230332312), we get a palindrome (33654533545633).

The spelling of 21323303213321 in words is "twenty-one trillion, three hundred twenty-three billion, three hundred three million, two hundred thirteen thousand, three hundred twenty-one".