1021100100217 has 2 divisors, whose sum is σ = 1021100100218. Its totient is φ = 1021100100216.

The previous prime is 1021100100199. The next prime is 1021100100289. The reversal of 1021100100217 is 7120010011201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 903936971536 + 117163128681 = 950756^2 + 342291^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021100100217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021100100217.

It is not a weakly prime, because it can be changed into another prime (1021100100017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510550050108 + 510550050109.

It is an arithmetic number, because the mean of its divisors is an integer number (510550050109).

Almost surely, 2^{1021100100217} is an apocalyptic number.

It is an amenable number.

1021100100217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021100100217 is an equidigital number, since it uses as much as digits as its factorization.

1021100100217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 1021100100217 its reverse (7120010011201), we get a palindrome (8141110111418).

The spelling of 1021100100217 in words is "one trillion, twenty-one billion, one hundred million, one hundred thousand, two hundred seventeen".