21024561426541 has 2 divisors, whose sum is σ = 21024561426542. Its totient is φ = 21024561426540.

The previous prime is 21024561426521. The next prime is 21024561426581. The reversal of 21024561426541 is 14562416542012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13618793833225 + 7405767593316 = 3690365^2 + 2721354^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024561426541 - 2⁵ = 21024561426509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21024561426511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512280713270 + 10512280713271.

It is an arithmetic number, because the mean of its divisors is an integer number (10512280713271).

Almost surely, 2^{21024561426541} is an apocalyptic number.

It is an amenable number.

21024561426541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024561426541 is an equidigital number, since it uses as much as digits as its factorization.

21024561426541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460800, while the sum is 43.

Adding to 21024561426541 its reverse (14562416542012), we get a palindrome (35586977968553).

The spelling of 21024561426541 in words is "twenty-one trillion, twenty-four billion, five hundred sixty-one million, four hundred twenty-six thousand, five hundred forty-one".