10212021217 has 2 divisors, whose sum is σ = 10212021218. Its totient is φ = 10212021216.

The previous prime is 10212021107. The next prime is 10212021223. The reversal of 10212021217 is 71212021201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8564391936 + 1647629281 = 92544^2 + 40591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10212021217 is a prime.

It is a super-2 number, since 2×10212021217² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10212021194 and 10212021203.

It is not a weakly prime, because it can be changed into another prime (10212021817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106010608 + 5106010609.

It is an arithmetic number, because the mean of its divisors is an integer number (5106010609).

Almost surely, 2^10212021217 is an apocalyptic number.

It is an amenable number.

10212021217 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212021217 is an equidigital number, since it uses as much as digits as its factorization.

10212021217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 10212021217 its reverse (71212021201), we get a palindrome (81424042418).

The spelling of 10212021217 in words is "ten billion, two hundred twelve million, twenty-one thousand, two hundred seventeen".