2101506 has 32 divisors (see below), whose sum is σ = 4857408. Its totient is φ = 599040.

The previous prime is 2101501. The next prime is 2101513. The reversal of 2101506 is 6051012.

2101506 is nontrivially palindromic in base 4 and base 16.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2101501) 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, 186 + ... + 2058.

It is an arithmetic number, because the mean of its divisors is an integer number (151794).

2^2101506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2428704).

2101506 is an abundant number, since it is smaller than the sum of its proper divisors (2755902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101506 is a wasteful number, since it uses less digits than its factorization.

2101506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 2101506 is about 1449.6572008582. The cubic root of 2101506 is about 128.0885211240.

Adding to 2101506 its reverse (6051012), we get a palindrome (8152518).

The spelling of 2101506 in words is "two million, one hundred one thousand, five hundred six".