21265333132021 has 32 divisors (see below), whose sum is σ = 23646944563200. Its totient is φ = 18960008887680.

The previous prime is 21265333132019. The next prime is 21265333132033. The reversal of 21265333132021 is 12023133356212.

It is a cyclic number.

It is not a de Polignac number, because 21265333132021 - 2¹ = 21265333132019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265333132721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1932679506 + ... + 1932690508.

It is an arithmetic number, because the mean of its divisors is an integer number (738967017600).

Almost surely, 2^{21265333132021} is an apocalyptic number.

It is an amenable number.

21265333132021 is a deficient number, since it is larger than the sum of its proper divisors (2381611431179).

21265333132021 is a wasteful number, since it uses less digits than its factorization.

21265333132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17769.

The product of its (nonzero) digits is 38880, while the sum is 34.

Adding to 21265333132021 its reverse (12023133356212), we get a palindrome (33288466488233).

The spelling of 21265333132021 in words is "twenty-one trillion, two hundred sixty-five billion, three hundred thirty-three million, one hundred thirty-two thousand, twenty-one".