21124545289 has 2 divisors, whose sum is σ = 21124545290. Its totient is φ = 21124545288.

The previous prime is 21124545283. The next prime is 21124545311. The reversal of 21124545289 is 98254542112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12793419664 + 8331125625 = 113108^2 + 91275^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124545289 - 2¹³ = 21124537097 is a prime.

It is not a weakly prime, because it can be changed into another prime (21124545283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562272644 + 10562272645.

It is an arithmetic number, because the mean of its divisors is an integer number (10562272645).

Almost surely, 2^21124545289 is an apocalyptic number.

It is an amenable number.

21124545289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124545289 is an equidigital number, since it uses as much as digits as its factorization.

21124545289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 43.

The spelling of 21124545289 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, two hundred eighty-nine".