21045857811229 has 2 divisors, whose sum is σ = 21045857811230. Its totient is φ = 21045857811228.

The previous prime is 21045857811131. The next prime is 21045857811247. The reversal of 21045857811229 is 92211875854012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14134795179129 + 6911062632100 = 3759627^2 + 2628890^2 .

It is a cyclic number.

It is not a de Polignac number, because 21045857811229 - 2⁹ = 21045857810717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21045857811229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21045857811029) 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, 10522928905614 + 10522928905615.

It is an arithmetic number, because the mean of its divisors is an integer number (10522928905615).

Almost surely, 2^{21045857811229} is an apocalyptic number.

It is an amenable number.

21045857811229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21045857811229 is an equidigital number, since it uses as much as digits as its factorization.

21045857811229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3225600, while the sum is 55.

The spelling of 21045857811229 in words is "twenty-one trillion, forty-five billion, eight hundred fifty-seven million, eight hundred eleven thousand, two hundred twenty-nine".