2100245 has 16 divisors (see below), whose sum is σ = 3006720. Its totient is φ = 1377024.

The previous prime is 2100239. The next prime is 2100247. The reversal of 2100245 is 5420012.

2100245 = 74² + 75² + ... + 188².

It is a cyclic number.

It is not a de Polignac number, because 2100245 - 2⁴ = 2100229 is a prime.

It is a super-2 number, since 2×2100245² = 8822058120050, which contains 22 as substring.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 500 + ... + 2109.

It is an arithmetic number, because the mean of its divisors is an integer number (187920).

2^2100245 is an apocalyptic number.

It is an amenable number.

2100245 is a deficient number, since it is larger than the sum of its proper divisors (906475).

2100245 is a wasteful number, since it uses less digits than its factorization.

2100245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2100245 is about 1449.2222051846. Note that the first 4 decimals coincide. The cubic root of 2100245 is about 128.0628963352.

Adding to 2100245 its reverse (5420012), we get a palindrome (7520257).

The spelling of 2100245 in words is "two million, one hundred thousand, two hundred forty-five".