2122751 has 4 divisors (see below), whose sum is σ = 2126352. Its totient is φ = 2119152.

The previous prime is 2122741. The next prime is 2122753. The reversal of 2122751 is 1572212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2122751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686 + ... + 2171.

It is an arithmetic number, because the mean of its divisors is an integer number (531588).

2^2122751 is an apocalyptic number.

2122751 is a deficient number, since it is larger than the sum of its proper divisors (3601).

2122751 is an equidigital number, since it uses as much as digits as its factorization.

2122751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600.

The product of its digits is 280, while the sum is 20.

The square root of 2122751 is about 1456.9663688637. The cubic root of 2122751 is about 128.5187081323.

Adding to 2122751 its reverse (1572212), we get a palindrome (3694963).

The spelling of 2122751 in words is "two million, one hundred twenty-two thousand, seven hundred fifty-one".