21776067629 has 2 divisors, whose sum is σ = 21776067630. Its totient is φ = 21776067628.

The previous prime is 21776067539. The next prime is 21776067647. The reversal of 21776067629 is 92676067712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21763035529 + 13032100 = 147523^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 21776067629 - 2³² = 17481100333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21776067679) 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, 10888033814 + 10888033815.

It is an arithmetic number, because the mean of its divisors is an integer number (10888033815).

Almost surely, 2^21776067629 is an apocalyptic number.

It is an amenable number.

21776067629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21776067629 is an equidigital number, since it uses as much as digits as its factorization.

21776067629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 53.

The spelling of 21776067629 in words is "twenty-one billion, seven hundred seventy-six million, sixty-seven thousand, six hundred twenty-nine".