2123555 has 32 divisors (see below), whose sum is σ = 3193344. Its totient is φ = 1322496.

The previous prime is 2123491. The next prime is 2123557. The reversal of 2123555 is 5553212.

2123555 is a nontrivial binomial coefficient, being equal to C(86, 4).

It is not a de Polignac number, because 2123555 - 2⁶ = 2123491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123555.

It is not an unprimeable number, because it can be changed into a prime (2123557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25544 + ... + 25626.

It is an arithmetic number, because the mean of its divisors is an integer number (99792).

2^2123555 is an apocalyptic number.

2123555 is the 1190-th pentagonal number.

2123555 is a deficient number, since it is larger than the sum of its proper divisors (1069789).

2123555 is a wasteful number, since it uses less digits than its factorization.

2123555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155.

The product of its digits is 1500, while the sum is 23.

The square root of 2123555 is about 1457.2422585143. The cubic root of 2123555 is about 128.5349317337.

Adding to 2123555 its reverse (5553212), we get a palindrome (7676767).

The spelling of 2123555 in words is "two million, one hundred twenty-three thousand, five hundred fifty-five".