201673967021 has 2 divisors, whose sum is σ = 201673967022. Its totient is φ = 201673967020.

The previous prime is 201673966957. The next prime is 201673967057. The reversal of 201673967021 is 120769376102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151324890025 + 50349076996 = 389005^2 + 224386^2 .

It is a cyclic number.

It is not a de Polignac number, because 201673967021 - 2⁶ = 201673966957 is a prime.

It is a super-2 number, since 2×201673967021² (a number of 23 digits) contains 22 as substring.

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 (201673967081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100836983510 + 100836983511.

It is an arithmetic number, because the mean of its divisors is an integer number (100836983511).

Almost surely, 2^201673967021 is an apocalyptic number.

It is an amenable number.

201673967021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201673967021 is an equidigital number, since it uses as much as digits as its factorization.

201673967021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 44.

The spelling of 201673967021 in words is "two hundred one billion, six hundred seventy-three million, nine hundred sixty-seven thousand, twenty-one".