2106556 has 12 divisors (see below), whose sum is σ = 3722992. Its totient is φ = 1042848.

The previous prime is 2106551. The next prime is 2106563. The reversal of 2106556 is 6556012.

It is a super-2 number, since 2×2106556² = 8875156362272, which contains 22 as substring.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 2106556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145 + ... + 2968.

2^2106556 is an apocalyptic number.

It is an amenable number.

2106556 is a deficient number, since it is larger than the sum of its proper divisors (1616436).

2106556 is a wasteful number, since it uses less digits than its factorization.

2106556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220 (or 5218 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2106556 is about 1451.3979468085. The cubic root of 2106556 is about 128.1910396019.

It can be divided in two parts, 2106 and 556, that added together give a palindrome (2662).

The spelling of 2106556 in words is "two million, one hundred six thousand, five hundred fifty-six".