2100556 has 12 divisors (see below), whose sum is σ = 3692920. Its totient is φ = 1045440.

The previous prime is 2100551. The next prime is 2100559. The reversal of 2100556 is 6550012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2100551) 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 in 3 ways as a sum of consecutive naturals, for example, 126 + ... + 2053.

2^2100556 is an apocalyptic number.

It is an amenable number.

2100556 is a deficient number, since it is larger than the sum of its proper divisors (1592364).

2100556 is a wasteful number, since it uses less digits than its factorization.

2100556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424 (or 2422 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 2100556 is about 1449.3295001483. The cubic root of 2100556 is about 128.0692171208.

Adding to 2100556 its reverse (6550012), we get a palindrome (8650568).

The spelling of 2100556 in words is "two million, one hundred thousand, five hundred fifty-six".