21866003429 has 2 divisors, whose sum is σ = 21866003430. Its totient is φ = 21866003428.

The previous prime is 21866003407. The next prime is 21866003441. The reversal of 21866003429 is 92430066812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21851639329 + 14364100 = 147823^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 21866003429 - 2¹⁶ = 21865937893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21866003329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10933001714 + 10933001715.

It is an arithmetic number, because the mean of its divisors is an integer number (10933001715).

Almost surely, 2^21866003429 is an apocalyptic number.

It is an amenable number.

21866003429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21866003429 is an equidigital number, since it uses as much as digits as its factorization.

21866003429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21866003429 in words is "twenty-one billion, eight hundred sixty-six million, three thousand, four hundred twenty-nine".