21145142243153 has 2 divisors, whose sum is σ = 21145142243154. Its totient is φ = 21145142243152.

The previous prime is 21145142243149. The next prime is 21145142243167. The reversal of 21145142243153 is 35134224154112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15755445691969 + 5389696551184 = 3969313^2 + 2321572^2 .

It is a cyclic number.

It is not a de Polignac number, because 21145142243153 - 2² = 21145142243149 is a prime.

It is not a weakly prime, because it can be changed into another prime (21145142243123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572571121576 + 10572571121577.

It is an arithmetic number, because the mean of its divisors is an integer number (10572571121577).

Almost surely, 2^{21145142243153} is an apocalyptic number.

It is an amenable number.

21145142243153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145142243153 is an equidigital number, since it uses as much as digits as its factorization.

21145142243153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 38.

Adding to 21145142243153 its reverse (35134224154112), we get a palindrome (56279366397265).

The spelling of 21145142243153 in words is "twenty-one trillion, one hundred forty-five billion, one hundred forty-two million, two hundred forty-three thousand, one hundred fifty-three".