2100045 has 16 divisors (see below), whose sum is σ = 3382272. Its totient is φ = 1112640.

The previous prime is 2100041. The next prime is 2100053. The reversal of 2100045 is 5400012.

It is not a de Polignac number, because 2100045 - 2² = 2100041 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2100045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100041) 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, 2499 + ... + 3231.

It is an arithmetic number, because the mean of its divisors is an integer number (211392).

2^2100045 is an apocalyptic number.

It is an amenable number.

2100045 is a deficient number, since it is larger than the sum of its proper divisors (1282227).

2100045 is a wasteful number, since it uses less digits than its factorization.

2100045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 2100045 is about 1449.1532010109. The cubic root of 2100045 is about 128.0588311916.

Adding to 2100045 its reverse (5400012), we get a palindrome (7500057).

The spelling of 2100045 in words is "two million, one hundred thousand, forty-five".