21063529 has 2 divisors, whose sum is σ = 21063530. Its totient is φ = 21063528.

The previous prime is 21063521. The next prime is 21063569. The reversal of 21063529 is 92536012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 1243225 = 4452^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 21063529 - 2³ = 21063521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21063497 and 21063506.

It is not a weakly prime, because it can be changed into another prime (21063521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531764 + 10531765.

It is an arithmetic number, because the mean of its divisors is an integer number (10531765).

Almost surely, 2^21063529 is an apocalyptic number.

It is an amenable number.

21063529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21063529 is an equidigital number, since it uses as much as digits as its factorization.

21063529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 21063529 is about 4589.5020427057. The cubic root of 21063529 is about 276.1703466017.

The spelling of 21063529 in words is "twenty-one million, sixty-three thousand, five hundred twenty-nine".