21141905573 has 2 divisors, whose sum is σ = 21141905574. Its totient is φ = 21141905572.

The previous prime is 21141905567. The next prime is 21141905581. The reversal of 21141905573 is 37550914112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21027030049 + 114875524 = 145007^2 + 10718^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141905573 - 2¹⁰ = 21141904549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141905513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570952786 + 10570952787.

It is an arithmetic number, because the mean of its divisors is an integer number (10570952787).

Almost surely, 2^21141905573 is an apocalyptic number.

It is an amenable number.

21141905573 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141905573 is an equidigital number, since it uses as much as digits as its factorization.

21141905573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 21141905573 in words is "twenty-one billion, one hundred forty-one million, nine hundred five thousand, five hundred seventy-three".