2112155 has 4 divisors (see below), whose sum is σ = 2534592. Its totient is φ = 1689720.

The previous prime is 2112151. The next prime is 2112161. The reversal of 2112155 is 5512112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2112155 - 2² = 2112151 is a prime.

It is a super-2 number, since 2×2112155² = 8922397488050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112151) 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, 211211 + ... + 211220.

It is an arithmetic number, because the mean of its divisors is an integer number (633648).

2^2112155 is an apocalyptic number.

2112155 is a deficient number, since it is larger than the sum of its proper divisors (422437).

2112155 is an equidigital number, since it uses as much as digits as its factorization.

2112155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422436.

The product of its digits is 100, while the sum is 17.

The square root of 2112155 is about 1453.3254969208. The cubic root of 2112155 is about 128.3045118088.

Adding to 2112155 its reverse (5512112), we get a palindrome (7624267).

It can be divided in two parts, 21 and 12155, that multiplied together give a triangular number (255255 = T₇₁₄).

The spelling of 2112155 in words is "two million, one hundred twelve thousand, one hundred fifty-five".