21322302121 has 2 divisors, whose sum is σ = 21322302122. Its totient is φ = 21322302120.

The previous prime is 21322302103. The next prime is 21322302137. The reversal of 21322302121 is 12120322312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20101568400 + 1220733721 = 141780^2 + 34939^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322302121 - 2⁷ = 21322301993 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322302101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661151060 + 10661151061.

It is an arithmetic number, because the mean of its divisors is an integer number (10661151061).

Almost surely, 2^21322302121 is an apocalyptic number.

It is an amenable number.

21322302121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322302121 is an equidigital number, since it uses as much as digits as its factorization.

21322302121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21322302121 its reverse (12120322312), we get a palindrome (33442624433).

The spelling of 21322302121 in words is "twenty-one billion, three hundred twenty-two million, three hundred two thousand, one hundred twenty-one".