20435141521 has 2 divisors, whose sum is σ = 20435141522. Its totient is φ = 20435141520.

The previous prime is 20435141501. The next prime is 20435141527. The reversal of 20435141521 is 12514153402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18235531521 + 2199610000 = 135039^2 + 46900^2 .

It is a cyclic number.

It is not a de Polignac number, because 20435141521 - 2¹⁹ = 20434617233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20435141521.

It is not a weakly prime, because it can be changed into another prime (20435141527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217570760 + 10217570761.

It is an arithmetic number, because the mean of its divisors is an integer number (10217570761).

Almost surely, 2^20435141521 is an apocalyptic number.

It is an amenable number.

20435141521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20435141521 is an equidigital number, since it uses as much as digits as its factorization.

20435141521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 20435141521 its reverse (12514153402), we get a palindrome (32949294923).

The spelling of 20435141521 in words is "twenty billion, four hundred thirty-five million, one hundred forty-one thousand, five hundred twenty-one".