21127686859 has 2 divisors, whose sum is σ = 21127686860. Its totient is φ = 21127686858.

The previous prime is 21127686829. The next prime is 21127686869. The reversal of 21127686859 is 95868672112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21127686859 - 2¹³ = 21127678667 is a prime.

It is a super-3 number, since 3×21127686859³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21127686829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563843429 + 10563843430.

It is an arithmetic number, because the mean of its divisors is an integer number (10563843430).

Almost surely, 2^21127686859 is an apocalyptic number.

21127686859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21127686859 is an equidigital number, since it uses as much as digits as its factorization.

21127686859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 55.

The spelling of 21127686859 in words is "twenty-one billion, one hundred twenty-seven million, six hundred eighty-six thousand, eight hundred fifty-nine".