21533053489 has 2 divisors, whose sum is σ = 21533053490. Its totient is φ = 21533053488.

The previous prime is 21533053483. The next prime is 21533053543. The reversal of 21533053489 is 98435033512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17123031025 + 4410022464 = 130855^2 + 66408^2 .

It is a cyclic number.

It is not a de Polignac number, because 21533053489 - 2³ = 21533053481 is a prime.

It is not a weakly prime, because it can be changed into another prime (21533053481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766526744 + 10766526745.

It is an arithmetic number, because the mean of its divisors is an integer number (10766526745).

Almost surely, 2^21533053489 is an apocalyptic number.

It is an amenable number.

21533053489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21533053489 is an equidigital number, since it uses as much as digits as its factorization.

21533053489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 21533053489 in words is "twenty-one billion, five hundred thirty-three million, fifty-three thousand, four hundred eighty-nine".