21400044241321 has 8 divisors (see below), whose sum is σ = 21693287187144. Its totient is φ = 21106803772800.

The previous prime is 21400044241271. The next prime is 21400044241343. The reversal of 21400044241321 is 12314244000412.

It can be written as a sum of positive squares in 4 ways, for example, as 187433580096 + 21212610661225 = 432936^2 + 4605715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21400044241321 - 2³¹ = 21397896757673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21400044241321.

It is not an unprimeable number, because it can be changed into a prime (21400044241361) 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 in 7 ways as a sum of consecutive naturals, for example, 22803471 + ... + 23723371.

It is an arithmetic number, because the mean of its divisors is an integer number (2711660898393).

Almost surely, 2^{21400044241321} is an apocalyptic number.

It is an amenable number.

21400044241321 is a deficient number, since it is larger than the sum of its proper divisors (293242945823).

21400044241321 is an equidigital number, since it uses as much as digits as its factorization.

21400044241321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238651.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21400044241321 its reverse (12314244000412), we get a palindrome (33714288241733).

The spelling of 21400044241321 in words is "twenty-one trillion, four hundred billion, forty-four million, two hundred forty-one thousand, three hundred twenty-one".