21230326404145 has 16 divisors (see below), whose sum is σ = 25763376937680. Its totient is φ = 16792948491264.

The previous prime is 21230326404143. The next prime is 21230326404193. The reversal of 21230326404145 is 54140462303212.

It can be written as a sum of positive squares in 8 ways, for example, as 2338229382129 + 18892097022016 = 1529127^2 + 4346504^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230326404145 - 2¹ = 21230326404143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21230326404143) 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 in 15 ways as a sum of consecutive naturals, for example, 15391207 + ... + 16713763.

It is an arithmetic number, because the mean of its divisors is an integer number (1610211058605).

Almost surely, 2^{21230326404145} is an apocalyptic number.

It is an amenable number.

21230326404145 is a deficient number, since it is larger than the sum of its proper divisors (4533050533535).

21230326404145 is a wasteful number, since it uses less digits than its factorization.

21230326404145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358724.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 21230326404145 its reverse (54140462303212), we get a palindrome (75370788707357).

The spelling of 21230326404145 in words is "twenty-one trillion, two hundred thirty billion, three hundred twenty-six million, four hundred four thousand, one hundred forty-five".