2121375 has 16 divisors (see below), whose sum is σ = 3530592. Its totient is φ = 1131200.

The previous prime is 2121373. The next prime is 2121377. The reversal of 2121375 is 5731212.

It is an interprime number because it is at equal distance from previous prime (2121373) and next prime (2121377).

It is not a de Polignac number, because 2121375 - 2¹ = 2121373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2454 + ... + 3203.

It is an arithmetic number, because the mean of its divisors is an integer number (220662).

2^2121375 is an apocalyptic number.

2121375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2121375 is a deficient number, since it is larger than the sum of its proper divisors (1409217).

2121375 is an equidigital number, since it uses as much as digits as its factorization.

2121375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5675 (or 5665 counting only the distinct ones).

The product of its digits is 420, while the sum is 21.

The square root of 2121375 is about 1456.4940782578. The cubic root of 2121375 is about 128.4909328591.

Adding to 2121375 its reverse (5731212), we get a palindrome (7852587).

The spelling of 2121375 in words is "two million, one hundred twenty-one thousand, three hundred seventy-five".