20002121112173 has 2 divisors, whose sum is σ = 20002121112174. Its totient is φ = 20002121112172.

The previous prime is 20002121112139. The next prime is 20002121112343. The reversal of 20002121112173 is 37121112120002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11014944541129 + 8987176571044 = 3318877^2 + 2997862^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002121112173 - 2¹² = 20002121108077 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 (20002121912173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001060556086 + 10001060556087.

It is an arithmetic number, because the mean of its divisors is an integer number (10001060556087).

Almost surely, 2^{20002121112173} is an apocalyptic number.

It is an amenable number.

20002121112173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002121112173 is an equidigital number, since it uses as much as digits as its factorization.

20002121112173 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 23.

Adding to 20002121112173 its reverse (37121112120002), we get a palindrome (57123233232175).

The spelling of 20002121112173 in words is "twenty trillion, two billion, one hundred twenty-one million, one hundred twelve thousand, one hundred seventy-three".