21122341321 has 2 divisors, whose sum is σ = 21122341322. Its totient is φ = 21122341320.

The previous prime is 21122341259. The next prime is 21122341343. The reversal of 21122341321 is 12314322112.

It is an a-pointer prime, because the next prime (21122341343) can be obtained adding 21122341321 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14753503296 + 6368838025 = 121464^2 + 79805^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122341321 - 2¹³ = 21122333129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21122341292 and 21122341301.

It is not a weakly prime, because it can be changed into another prime (21122341421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561170660 + 10561170661.

It is an arithmetic number, because the mean of its divisors is an integer number (10561170661).

Almost surely, 2^21122341321 is an apocalyptic number.

It is an amenable number.

21122341321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122341321 is an equidigital number, since it uses as much as digits as its factorization.

21122341321 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21122341321 its reverse (12314322112), we get a palindrome (33436663433).

The spelling of 21122341321 in words is "twenty-one billion, one hundred twenty-two million, three hundred forty-one thousand, three hundred twenty-one".