21404144141 has 2 divisors, whose sum is σ = 21404144142. Its totient is φ = 21404144140.

The previous prime is 21404144033. The next prime is 21404144159. The reversal of 21404144141 is 14144140412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16892200900 + 4511943241 = 129970^2 + 67171^2 .

It is a cyclic number.

It is not a de Polignac number, because 21404144141 - 2²⁶ = 21337035277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21404144141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21400144141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702072070 + 10702072071.

It is an arithmetic number, because the mean of its divisors is an integer number (10702072071).

Almost surely, 2^21404144141 is an apocalyptic number.

It is an amenable number.

21404144141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404144141 is an equidigital number, since it uses as much as digits as its factorization.

21404144141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 26.

Adding to 21404144141 its reverse (14144140412), we get a palindrome (35548284553).

The spelling of 21404144141 in words is "twenty-one billion, four hundred four million, one hundred forty-four thousand, one hundred forty-one".