21102313321 has 2 divisors, whose sum is σ = 21102313322. Its totient is φ = 21102313320.

The previous prime is 21102313313. The next prime is 21102313327. The reversal of 21102313321 is 12331320112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21079845721 + 22467600 = 145189^2 + 4740^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102313321 - 2³ = 21102313313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102313327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551156660 + 10551156661.

It is an arithmetic number, because the mean of its divisors is an integer number (10551156661).

Almost surely, 2^21102313321 is an apocalyptic number.

It is an amenable number.

21102313321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102313321 is an equidigital number, since it uses as much as digits as its factorization.

21102313321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21102313321 its reverse (12331320112), we get a palindrome (33433633433).

The spelling of 21102313321 in words is "twenty-one billion, one hundred two million, three hundred thirteen thousand, three hundred twenty-one".