21033321021329 has 2 divisors, whose sum is σ = 21033321021330. Its totient is φ = 21033321021328.

The previous prime is 21033321021241. The next prime is 21033321021367. The reversal of 21033321021329 is 92312012333012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13738179315025 + 7295141706304 = 3706505^2 + 2700952^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033321021329 - 2⁴⁴ = 3441134976913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033321021295 and 21033321021304.

It is not a weakly prime, because it can be changed into another prime (21033326021329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516660510664 + 10516660510665.

It is an arithmetic number, because the mean of its divisors is an integer number (10516660510665).

Almost surely, 2^{21033321021329} is an apocalyptic number.

It is an amenable number.

21033321021329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033321021329 is an equidigital number, since it uses as much as digits as its factorization.

21033321021329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The spelling of 21033321021329 in words is "twenty-one trillion, thirty-three billion, three hundred twenty-one million, twenty-one thousand, three hundred twenty-nine".