21044022829 has 2 divisors, whose sum is σ = 21044022830. Its totient is φ = 21044022828.

The previous prime is 21044022823. The next prime is 21044022859. The reversal of 21044022829 is 92822044012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18516949929 + 2527072900 = 136077^2 + 50270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044022829 - 2³ = 21044022821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21044022794 and 21044022803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21044022821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522011414 + 10522011415.

It is an arithmetic number, because the mean of its divisors is an integer number (10522011415).

Almost surely, 2^21044022829 is an apocalyptic number.

It is an amenable number.

21044022829 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044022829 is an equidigital number, since it uses as much as digits as its factorization.

21044022829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 34.

The spelling of 21044022829 in words is "twenty-one billion, forty-four million, twenty-two thousand, eight hundred twenty-nine".