10021021217 has 2 divisors, whose sum is σ = 10021021218. Its totient is φ = 10021021216.

The previous prime is 10021021187. The next prime is 10021021279. The reversal of 10021021217 is 71212012001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9139168801 + 881852416 = 95599^2 + 29696^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021021217 - 2¹⁰ = 10021020193 is a prime.

It is a super-2 number, since 2×10021021217² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10021021195 and 10021021204.

It is not a weakly prime, because it can be changed into another prime (10021024217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010510608 + 5010510609.

It is an arithmetic number, because the mean of its divisors is an integer number (5010510609).

Almost surely, 2^10021021217 is an apocalyptic number.

It is an amenable number.

10021021217 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021021217 is an equidigital number, since it uses as much as digits as its factorization.

10021021217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 10021021217 its reverse (71212012001), we get a palindrome (81233033218).

The spelling of 10021021217 in words is "ten billion, twenty-one million, twenty-one thousand, two hundred seventeen".