21010120013329 has 2 divisors, whose sum is σ = 21010120013330. Its totient is φ = 21010120013328.

The previous prime is 21010120013327. The next prime is 21010120013339. The reversal of 21010120013329 is 92331002101012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11581443535104 + 9428676478225 = 3403152^2 + 3070615^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010120013329 - 2¹ = 21010120013327 is a prime.

Together with 21010120013327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21010120013327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505060006664 + 10505060006665.

It is an arithmetic number, because the mean of its divisors is an integer number (10505060006665).

Almost surely, 2^{21010120013329} is an apocalyptic number.

It is an amenable number.

21010120013329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010120013329 is an equidigital number, since it uses as much as digits as its factorization.

21010120013329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21010120013329 in words is "twenty-one trillion, ten billion, one hundred twenty million, thirteen thousand, three hundred twenty-nine".