10212021817 has 2 divisors, whose sum is σ = 10212021818. Its totient is φ = 10212021816.

The previous prime is 10212021811. The next prime is 10212021851. The reversal of 10212021817 is 71812021201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10103466256 + 108555561 = 100516^2 + 10419^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212021817 - 2³¹ = 8064538169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10212021791 and 10212021800.

It is not a weakly prime, because it can be changed into another prime (10212021811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106010908 + 5106010909.

It is an arithmetic number, because the mean of its divisors is an integer number (5106010909).

Almost surely, 2^10212021817 is an apocalyptic number.

It is an amenable number.

10212021817 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212021817 is an equidigital number, since it uses as much as digits as its factorization.

10212021817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 25.

The spelling of 10212021817 in words is "ten billion, two hundred twelve million, twenty-one thousand, eight hundred seventeen".