21110533289 has 2 divisors, whose sum is σ = 21110533290. Its totient is φ = 21110533288.

The previous prime is 21110533271. The next prime is 21110533351. The reversal of 21110533289 is 98233501112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15552085264 + 5558448025 = 124708^2 + 74555^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110533289 - 2⁸ = 21110533033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110503289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555266644 + 10555266645.

It is an arithmetic number, because the mean of its divisors is an integer number (10555266645).

Almost surely, 2^21110533289 is an apocalyptic number.

It is an amenable number.

21110533289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110533289 is an equidigital number, since it uses as much as digits as its factorization.

21110533289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 21110533289 in words is "twenty-one billion, one hundred ten million, five hundred thirty-three thousand, two hundred eighty-nine".