2124181 has 4 divisors (see below), whose sum is σ = 2236000. Its totient is φ = 2012364.

The previous prime is 2124173. The next prime is 2124191. The reversal of 2124181 is 1814212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2124181 - 2³ = 2124173 is a prime.

It is a super-2 number, since 2×2124181² = 9024289841522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 111799 = 2124181 / (2 + 1 + 2 + 4 + 1 + 8 + 1).

It is a Duffinian number.

2124181 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2124191) 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, 55881 + ... + 55918.

It is an arithmetic number, because the mean of its divisors is an integer number (559000).

2^2124181 is an apocalyptic number.

It is an amenable number.

2124181 is a deficient number, since it is larger than the sum of its proper divisors (111819).

2124181 is a wasteful number, since it uses less digits than its factorization.

2124181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111818.

The product of its digits is 128, while the sum is 19.

The square root of 2124181 is about 1457.4570319567. The cubic root of 2124181 is about 128.5475607076.

Adding to 2124181 its reverse (1814212), we get a palindrome (3938393).

The spelling of 2124181 in words is "two million, one hundred twenty-four thousand, one hundred eighty-one".