2120556 has 12 divisors (see below), whose sum is σ = 4947992. Its totient is φ = 706848.

The previous prime is 2120551. The next prime is 2120579. The reversal of 2120556 is 6550212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2120551) 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, 88345 + ... + 88368.

2^2120556 is an apocalyptic number.

It is an amenable number.

2120556 is an abundant number, since it is smaller than the sum of its proper divisors (2827436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2120556 is a wasteful number, since it uses less digits than its factorization.

2120556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176720 (or 176718 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2120556 is about 1456.2128965230. The cubic root of 2120556 is about 128.4743952173.

Adding to 2120556 its reverse (6550212), we get a palindrome (8670768).

The spelling of 2120556 in words is "two million, one hundred twenty thousand, five hundred fifty-six".