200021211120173 has 2 divisors, whose sum is σ = 200021211120174. Its totient is φ = 200021211120172.

The previous prime is 200021211119987. The next prime is 200021211120223. The reversal of 200021211120173 is 371021112120002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195120752284969 + 4900458835204 = 13968563^2 + 2213698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200021211120173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200021211128173) 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, 100010605560086 + 100010605560087.

It is an arithmetic number, because the mean of its divisors is an integer number (100010605560087).

Almost surely, 2^{200021211120173} is an apocalyptic number.

It is an amenable number.

200021211120173 is a deficient number, since it is larger than the sum of its proper divisors (1).

200021211120173 is an equidigital number, since it uses as much as digits as its factorization.

200021211120173 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 23.

Adding to 200021211120173 its reverse (371021112120002), we get a palindrome (571042323240175).

The spelling of 200021211120173 in words is "two hundred trillion, twenty-one billion, two hundred eleven million, one hundred twenty thousand, one hundred seventy-three".