21233302121 has 2 divisors, whose sum is σ = 21233302122. Its totient is φ = 21233302120.

The previous prime is 21233302117. The next prime is 21233302187. The reversal of 21233302121 is 12120333212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21232861225 + 440896 = 145715^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233302121 - 2² = 21233302117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21233302093 and 21233302102.

It is not a weakly prime, because it can be changed into another prime (21233308121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616651060 + 10616651061.

It is an arithmetic number, because the mean of its divisors is an integer number (10616651061).

Almost surely, 2^21233302121 is an apocalyptic number.

It is an amenable number.

21233302121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233302121 is an equidigital number, since it uses as much as digits as its factorization.

21233302121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21233302121 its reverse (12120333212), we get a palindrome (33353635333).

The spelling of 21233302121 in words is "twenty-one billion, two hundred thirty-three million, three hundred two thousand, one hundred twenty-one".