21023604529 has 2 divisors, whose sum is σ = 21023604530. Its totient is φ = 21023604528.

The previous prime is 21023604509. The next prime is 21023604551. The reversal of 21023604529 is 92540632012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16879206400 + 4144398129 = 129920^2 + 64377^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023604529 - 2⁷ = 21023604401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023604494 and 21023604503.

It is not a weakly prime, because it can be changed into another prime (21023604509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511802264 + 10511802265.

It is an arithmetic number, because the mean of its divisors is an integer number (10511802265).

Almost surely, 2^21023604529 is an apocalyptic number.

It is an amenable number.

21023604529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023604529 is an equidigital number, since it uses as much as digits as its factorization.

21023604529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21023604529 in words is "twenty-one billion, twenty-three million, six hundred four thousand, five hundred twenty-nine".