21036413969 has 6 divisors (see below), whose sum is σ = 21736899090. Its totient is φ = 20357819040.

The previous prime is 21036413941. The next prime is 21036413999. The reversal of 21036413969 is 96931463012.

It can be written as a sum of positive squares in only one way, i.e., 20761351744 + 275062225 = 144088^2 + 16585^2 .

It is not a de Polignac number, because 21036413969 - 2²⁴ = 21019636753 is a prime.

It is a super-2 number, since 2×21036413969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21036413999) 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 in 5 ways as a sum of consecutive naturals, for example, 10944104 + ... + 10946025.

It is an arithmetic number, because the mean of its divisors is an integer number (3622816515).

Almost surely, 2^21036413969 is an apocalyptic number.

It is an amenable number.

21036413969 is a deficient number, since it is larger than the sum of its proper divisors (700485121).

21036413969 is an equidigital number, since it uses as much as digits as its factorization.

21036413969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21890191 (or 21890160 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The spelling of 21036413969 in words is "twenty-one billion, thirty-six million, four hundred thirteen thousand, nine hundred sixty-nine".