21004000229 has 2 divisors, whose sum is σ = 21004000230. Its totient is φ = 21004000228.

The previous prime is 21004000181. The next prime is 21004000261. The reversal of 21004000229 is 92200040012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12320556004 + 8683444225 = 110998^2 + 93185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004000229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21004000229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004000279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502000114 + 10502000115.

It is an arithmetic number, because the mean of its divisors is an integer number (10502000115).

Almost surely, 2^21004000229 is an apocalyptic number.

It is an amenable number.

21004000229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004000229 is an equidigital number, since it uses as much as digits as its factorization.

21004000229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The spelling of 21004000229 in words is "twenty-one billion, four million, two hundred twenty-nine", and thus it is an aban number.