20098121 has 2 divisors, whose sum is σ = 20098122. Its totient is φ = 20098120.

The previous prime is 20098087. The next prime is 20098123. The reversal of 20098121 is 12189002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 1132096 = 4355^2 + 1064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20098121 is a prime.

Together with 20098123, 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 (20098123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10049060 + 10049061.

It is an arithmetic number, because the mean of its divisors is an integer number (10049061).

Almost surely, 2^20098121 is an apocalyptic number.

It is an amenable number.

20098121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20098121 is an equidigital number, since it uses as much as digits as its factorization.

20098121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20098121 is about 4483.0927940430. The cubic root of 20098121 is about 271.8849399810.

The spelling of 20098121 in words is "twenty million, ninety-eight thousand, one hundred twenty-one".