21861063319 has 2 divisors, whose sum is σ = 21861063320. Its totient is φ = 21861063318.

The previous prime is 21861063311. The next prime is 21861063349. The reversal of 21861063319 is 91336016812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21861063319 - 2³ = 21861063311 is a prime.

It is a super-2 number, since 2×21861063319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21861063311) 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 as a sum of consecutive naturals, namely, 10930531659 + 10930531660.

It is an arithmetic number, because the mean of its divisors is an integer number (10930531660).

Almost surely, 2^21861063319 is an apocalyptic number.

21861063319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21861063319 is an equidigital number, since it uses as much as digits as its factorization.

21861063319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 21861063319 in words is "twenty-one billion, eight hundred sixty-one million, sixty-three thousand, three hundred nineteen".