1012021220173 has 2 divisors, whose sum is σ = 1012021220174. Its totient is φ = 1012021220172.

The previous prime is 1012021220131. The next prime is 1012021220207. The reversal of 1012021220173 is 3710221202101.

1012021220173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1011881081929 + 140138244 = 1005923^2 + 11838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012021220173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012021223173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506010610086 + 506010610087.

It is an arithmetic number, because the mean of its divisors is an integer number (506010610087).

Almost surely, 2^{1012021220173} is an apocalyptic number.

It is an amenable number.

1012021220173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012021220173 is an equidigital number, since it uses as much as digits as its factorization.

1012021220173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 1012021220173 its reverse (3710221202101), we get a palindrome (4722242422274).

The spelling of 1012021220173 in words is "one trillion, twelve billion, twenty-one million, two hundred twenty thousand, one hundred seventy-three".