21323114221 has 8 divisors (see below), whose sum is σ = 21366099000. Its totient is φ = 21280170240.

The previous prime is 21323114203. The next prime is 21323114233. The reversal of 21323114221 is 12241132312.

It can be written as a sum of positive squares in 4 ways, for example, as 735168996 + 20587945225 = 27114^2 + 143485^2 .

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-21323114221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323114192 and 21323114201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323184221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1169745 + ... + 1187833.

It is an arithmetic number, because the mean of its divisors is an integer number (2670762375).

Almost surely, 2^21323114221 is an apocalyptic number.

It is an amenable number.

21323114221 is a deficient number, since it is larger than the sum of its proper divisors (42984779).

21323114221 is a wasteful number, since it uses less digits than its factorization.

21323114221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20399.

The product of its digits is 576, while the sum is 22.

Adding to 21323114221 its reverse (12241132312), we get a palindrome (33564246533).

The spelling of 21323114221 in words is "twenty-one billion, three hundred twenty-three million, one hundred fourteen thousand, two hundred twenty-one".