2100243 has 4 divisors (see below), whose sum is σ = 2800328. Its totient is φ = 1400160.

The previous prime is 2100239. The next prime is 2100247. The reversal of 2100243 is 3420012.

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

It is an interprime number because it is at equal distance from previous prime (2100239) and next prime (2100247).

It is not a de Polignac number, because 2100243 - 2² = 2100239 is a prime.

It is a super-2 number, since 2×2100243² = 8822041318098, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100247) 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, 350038 + ... + 350043.

It is an arithmetic number, because the mean of its divisors is an integer number (700082).

2^2100243 is an apocalyptic number.

2100243 is a deficient number, since it is larger than the sum of its proper divisors (700085).

2100243 is an equidigital number, since it uses as much as digits as its factorization.

2100243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700084.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 2100243 is about 1449.2215151591. The cubic root of 2100243 is about 128.0628556850.

Adding to 2100243 its reverse (3420012), we get a palindrome (5520255).

The spelling of 2100243 in words is "two million, one hundred thousand, two hundred forty-three".