2100015 has 24 divisors (see below), whose sum is σ = 3800160. Its totient is φ = 1070784.

The previous prime is 2100011. The next prime is 2100031. The reversal of 2100015 is 5100012.

It is a happy number.

It is not a de Polignac number, because 2100015 - 2² = 2100011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

2100015 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21 + ... + 2049.

It is an arithmetic number, because the mean of its divisors is an integer number (158340).

2^2100015 is an apocalyptic number.

2100015 is a deficient number, since it is larger than the sum of its proper divisors (1700145).

2100015 is a wasteful number, since it uses less digits than its factorization.

2100015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063 (or 2060 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 2100015 is about 1449.1428501014. The cubic root of 2100015 is about 128.0582213978.

Adding to 2100015 its reverse (5100012), we get a palindrome (7200027).

The spelling of 2100015 in words is "two million, one hundred thousand, fifteen".