21869085913 has 2 divisors, whose sum is σ = 21869085914. Its totient is φ = 21869085912.

The previous prime is 21869085877. The next prime is 21869085971. The reversal of 21869085913 is 31958096812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14320430224 + 7548655689 = 119668^2 + 86883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21869085913 is a prime.

It is not a weakly prime, because it can be changed into another prime (21869085983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10934542956 + 10934542957.

It is an arithmetic number, because the mean of its divisors is an integer number (10934542957).

Almost surely, 2^21869085913 is an apocalyptic number.

It is an amenable number.

21869085913 is a deficient number, since it is larger than the sum of its proper divisors (1).

21869085913 is an equidigital number, since it uses as much as digits as its factorization.

21869085913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 21869085913 in words is "twenty-one billion, eight hundred sixty-nine million, eighty-five thousand, nine hundred thirteen".