21120306859669 has 2 divisors, whose sum is σ = 21120306859670. Its totient is φ = 21120306859668.

The previous prime is 21120306859661. The next prime is 21120306859793. The reversal of 21120306859669 is 96695860302112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20633961021444 + 486345838225 = 4542462^2 + 697385^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120306859669 - 2³ = 21120306859661 is a prime.

It is a super-2 number, since 2×21120306859669² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120306859661) 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, 10560153429834 + 10560153429835.

It is an arithmetic number, because the mean of its divisors is an integer number (10560153429835).

Almost surely, 2^{21120306859669} is an apocalyptic number.

It is an amenable number.

21120306859669 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120306859669 is an equidigital number, since it uses as much as digits as its factorization.

21120306859669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8398080, while the sum is 58.

The spelling of 21120306859669 in words is "twenty-one trillion, one hundred twenty billion, three hundred six million, eight hundred fifty-nine thousand, six hundred sixty-nine".