2100505 has 16 divisors (see below), whose sum is σ = 2778048. Its totient is φ = 1512000.

The previous prime is 2100493. The next prime is 2100523. The reversal of 2100505 is 5050012.

It is not a de Polignac number, because 2100505 - 2⁵ = 2100473 is a prime.

It is a Duffinian number.

2100505 is a modest number, since divided by 505 gives 210 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9850 + ... + 10060.

It is an arithmetic number, because the mean of its divisors is an integer number (173628).

2^2100505 is an apocalyptic number.

It is an amenable number.

2100505 is a deficient number, since it is larger than the sum of its proper divisors (677543).

2100505 is a wasteful number, since it uses less digits than its factorization.

2100505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 2100505 is about 1449.3119056987. The cubic root of 2100505 is about 128.0681806360.

Adding to 2100505 its reverse (5050012), we get a palindrome (7150517).

The spelling of 2100505 in words is "two million, one hundred thousand, five hundred five".