21700733069 has 2 divisors, whose sum is σ = 21700733070. Its totient is φ = 21700733068.

The previous prime is 21700732997. The next prime is 21700733077. The reversal of 21700733069 is 96033700712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18806831044 + 2893902025 = 137138^2 + 53795^2 .

It is a cyclic number.

It is not a de Polignac number, because 21700733069 - 2¹⁶ = 21700667533 is a prime.

It is a super-2 number, since 2×21700733069² (a number of 21 digits) contains 22 as substring.

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 (21700733269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10850366534 + 10850366535.

It is an arithmetic number, because the mean of its divisors is an integer number (10850366535).

Almost surely, 2^21700733069 is an apocalyptic number.

It is an amenable number.

21700733069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21700733069 is an equidigital number, since it uses as much as digits as its factorization.

21700733069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 38.

The spelling of 21700733069 in words is "twenty-one billion, seven hundred million, seven hundred thirty-three thousand, sixty-nine".