2102666 has 4 divisors (see below), whose sum is σ = 3154002. Its totient is φ = 1051332.

The previous prime is 2102651. The next prime is 2102687. The reversal of 2102666 is 6662012.

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., 2088025 + 14641 = 1445^2 + 121^2 .

It is an unprimeable number.

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, 525665 + ... + 525668.

2^2102666 is an apocalyptic number.

2102666 is a deficient number, since it is larger than the sum of its proper divisors (1051336).

2102666 is a wasteful number, since it uses less digits than its factorization.

2102666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051335.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 2102666 is about 1450.0572402495. The cubic root of 2102666 is about 128.1120844407.

Adding to 2102666 its reverse (6662012), we get a palindrome (8764678).

The spelling of 2102666 in words is "two million, one hundred two thousand, six hundred sixty-six".