2101247 has 2 divisors, whose sum is σ = 2101248. Its totient is φ = 2101246.

The previous prime is 2101243. The next prime is 2101249. The reversal of 2101247 is 7421012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101247 - 2² = 2101243 is a prime.

Together with 2101249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050623 + 1050624.

It is an arithmetic number, because the mean of its divisors is an integer number (1050624).

2^2101247 is an apocalyptic number.

2101247 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101247 is an equidigital number, since it uses as much as digits as its factorization.

2101247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 2101247 is about 1449.5678666416. The cubic root of 2101247 is about 128.0832588200.

Adding to 2101247 its reverse (7421012), we get a palindrome (9522259).

The spelling of 2101247 in words is "two million, one hundred one thousand, two hundred forty-seven".