21829529 has 2 divisors, whose sum is σ = 21829530. Its totient is φ = 21829528.

The previous prime is 21829501. The next prime is 21829567. The reversal of 21829529 is 92592812.

It is an a-pointer prime, because the next prime (21829567) can be obtained adding 21829529 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21603904 + 225625 = 4648^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 21829529 - 2⁸ = 21829273 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 21829529 parts by 6607 straight cuts.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21829492 and 21829501.

It is not a weakly prime, because it can be changed into another prime (21829579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10914764 + 10914765.

It is an arithmetic number, because the mean of its divisors is an integer number (10914765).

Almost surely, 2^21829529 is an apocalyptic number.

It is an amenable number.

21829529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21829529 is an equidigital number, since it uses as much as digits as its factorization.

21829529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 21829529 is about 4672.2081503289. The cubic root of 21829529 is about 279.4783186000.

It can be divided in two parts, 2182 and 9529, that added together give a palindrome (11711).

The spelling of 21829529 in words is "twenty-one million, eight hundred twenty-nine thousand, five hundred twenty-nine".