21127686829 has 2 divisors, whose sum is σ = 21127686830. Its totient is φ = 21127686828.

The previous prime is 21127686799. The next prime is 21127686859. The reversal of 21127686829 is 92868672112.

It is a balanced prime because it is at equal distance from previous prime (21127686799) and next prime (21127686859).

It can be written as a sum of positive squares in only one way, i.e., 21112671204 + 15015625 = 145302^2 + 3875^2 .

It is a cyclic number.

It is not a de Polignac number, because 21127686829 - 2³³ = 12537752237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21127686859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563843414 + 10563843415.

It is an arithmetic number, because the mean of its divisors is an integer number (10563843415).

Almost surely, 2^21127686829 is an apocalyptic number.

It is an amenable number.

21127686829 is a deficient number, since it is larger than the sum of its proper divisors (1).

21127686829 is an equidigital number, since it uses as much as digits as its factorization.

21127686829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 52.

The spelling of 21127686829 in words is "twenty-one billion, one hundred twenty-seven million, six hundred eighty-six thousand, eight hundred twenty-nine".