21210117070609 has 2 divisors, whose sum is σ = 21210117070610. Its totient is φ = 21210117070608.

The previous prime is 21210117070547. The next prime is 21210117070613. The reversal of 21210117070609 is 90607071101212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21162732488209 + 47384582400 = 4600297^2 + 217680^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210117070609 - 2¹⁵ = 21210117037841 is a prime.

It is a super-2 number, since 2×21210117070609² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21210117071609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605058535304 + 10605058535305.

It is an arithmetic number, because the mean of its divisors is an integer number (10605058535305).

Almost surely, 2^{21210117070609} is an apocalyptic number.

It is an amenable number.

21210117070609 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210117070609 is an equidigital number, since it uses as much as digits as its factorization.

21210117070609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 37.

The spelling of 21210117070609 in words is "twenty-one trillion, two hundred ten billion, one hundred seventeen million, seventy thousand, six hundred nine".