21010022021173 has 2 divisors, whose sum is σ = 21010022021174. Its totient is φ = 21010022021172.

The previous prime is 21010022021113. The next prime is 21010022021179. The reversal of 21010022021173 is 37112022001012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20410670445489 + 599351575684 = 4517817^2 + 774178^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010022021173 - 2⁹ = 21010022020661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010022021179) 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, 10505011010586 + 10505011010587.

It is an arithmetic number, because the mean of its divisors is an integer number (10505011010587).

Almost surely, 2^{21010022021173} is an apocalyptic number.

It is an amenable number.

21010022021173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010022021173 is an equidigital number, since it uses as much as digits as its factorization.

21010022021173 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21010022021173 its reverse (37112022001012), we get a palindrome (58122044022185).

The spelling of 21010022021173 in words is "twenty-one trillion, ten billion, twenty-two million, twenty-one thousand, one hundred seventy-three".