20121996676889 has 2 divisors, whose sum is σ = 20121996676890. Its totient is φ = 20121996676888.

The previous prime is 20121996676883. The next prime is 20121996676891. The reversal of 20121996676889 is 98867669912102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10861691221264 + 9260305455625 = 3295708^2 + 3043075^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121996676889 - 2⁸ = 20121996676633 is a prime.

Together with 20121996676891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20121996676883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060998338444 + 10060998338445.

It is an arithmetic number, because the mean of its divisors is an integer number (10060998338445).

Almost surely, 2^{20121996676889} is an apocalyptic number.

It is an amenable number.

20121996676889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121996676889 is an equidigital number, since it uses as much as digits as its factorization.

20121996676889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282175488, while the sum is 74.

The spelling of 20121996676889 in words is "twenty trillion, one hundred twenty-one billion, nine hundred ninety-six million, six hundred seventy-six thousand, eight hundred eighty-nine".