21202232199173 has 2 divisors, whose sum is σ = 21202232199174. Its totient is φ = 21202232199172.

The previous prime is 21202232199107. The next prime is 21202232199193. The reversal of 21202232199173 is 37199123220212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15920403241444 + 5281828957729 = 3990038^2 + 2298223^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202232199173 - 2²² = 21202228004869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202232199193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601116099586 + 10601116099587.

It is an arithmetic number, because the mean of its divisors is an integer number (10601116099587).

Almost surely, 2^{21202232199173} is an apocalyptic number.

It is an amenable number.

21202232199173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202232199173 is an equidigital number, since it uses as much as digits as its factorization.

21202232199173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 21202232199173 in words is "twenty-one trillion, two hundred two billion, two hundred thirty-two million, one hundred ninety-nine thousand, one hundred seventy-three".