2101706 has 4 divisors (see below), whose sum is σ = 3152562. Its totient is φ = 1050852.

The previous prime is 2101703. The next prime is 2101721. The reversal of 2101706 is 6071012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1809025 + 292681 = 1345^2 + 541^2 .

It is a super-2 number, since 2×2101706² = 8834336220872, which contains 22 as substring.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2101703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525425 + ... + 525428.

2^2101706 is an apocalyptic number.

2101706 is a deficient number, since it is larger than the sum of its proper divisors (1050856).

2101706 is a wasteful number, since it uses less digits than its factorization.

2101706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050855.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 2101706 is about 1449.7261810425. The cubic root of 2101706 is about 128.0925843833.

Adding to 2101706 its reverse (6071012), we get a palindrome (8172718).

The spelling of 2101706 in words is "two million, one hundred one thousand, seven hundred six".