2105420117 has 2 divisors, whose sum is σ = 2105420118. Its totient is φ = 2105420116.

The previous prime is 2105420113. The next prime is 2105420143. The reversal of 2105420117 is 7110245012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2061250801 + 44169316 = 45401^2 + 6646^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105420117 - 2² = 2105420113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2105420092 and 2105420101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105420113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052710058 + 1052710059.

It is an arithmetic number, because the mean of its divisors is an integer number (1052710059).

Almost surely, 2^2105420117 is an apocalyptic number.

It is an amenable number.

2105420117 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105420117 is an equidigital number, since it uses as much as digits as its factorization.

2105420117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 2105420117 is about 45884.8571644284. The cubic root of 2105420117 is about 1281.6799468848.

Adding to 2105420117 its reverse (7110245012), we get a palindrome (9215665129).

The spelling of 2105420117 in words is "two billion, one hundred five million, four hundred twenty thousand, one hundred seventeen".