1021100100173 has 2 divisors, whose sum is σ = 1021100100174. Its totient is φ = 1021100100172.

The previous prime is 1021100100103. The next prime is 1021100100199. The reversal of 1021100100173 is 3710010011201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 781169610244 + 239930489929 = 883838^2 + 489827^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021100100173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021100100103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510550050086 + 510550050087.

It is an arithmetic number, because the mean of its divisors is an integer number (510550050087).

Almost surely, 2^{1021100100173} is an apocalyptic number.

It is an amenable number.

1021100100173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021100100173 is an equidigital number, since it uses as much as digits as its factorization.

1021100100173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 17.

Adding to 1021100100173 its reverse (3710010011201), we get a palindrome (4731110111374).

The spelling of 1021100100173 in words is "one trillion, twenty-one billion, one hundred million, one hundred thousand, one hundred seventy-three".