21106775029 has 2 divisors, whose sum is σ = 21106775030. Its totient is φ = 21106775028.

The previous prime is 21106775003. The next prime is 21106775083. The reversal of 21106775029 is 92057760112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18035952804 + 3070822225 = 134298^2 + 55415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106775029 - 2⁷ = 21106774901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21106774982 and 21106775000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21106775089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553387514 + 10553387515.

It is an arithmetic number, because the mean of its divisors is an integer number (10553387515).

Almost surely, 2^21106775029 is an apocalyptic number.

It is an amenable number.

21106775029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106775029 is an equidigital number, since it uses as much as digits as its factorization.

21106775029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The spelling of 21106775029 in words is "twenty-one billion, one hundred six million, seven hundred seventy-five thousand, twenty-nine".