2100506 has 4 divisors (see below), whose sum is σ = 3150762. Its totient is φ = 1050252.

The previous prime is 2100493. The next prime is 2100523. The reversal of 2100506 is 6050012.

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., 2076481 + 24025 = 1441^2 + 155^2 .

It is a Curzon number.

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, 525125 + ... + 525128.

2^2100506 is an apocalyptic number.

2100506 is a deficient number, since it is larger than the sum of its proper divisors (1050256).

2100506 is a wasteful number, since it uses less digits than its factorization.

2100506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050255.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 2100506 is about 1449.3122506900. The cubic root of 2100506 is about 128.0682009594.

Adding to 2100506 its reverse (6050012), we get a palindrome (8150518).

The spelling of 2100506 in words is "two million, one hundred thousand, five hundred six".