2130505 has 16 divisors (see below), whose sum is σ = 2797200. Its totient is φ = 1548288.

The previous prime is 2130503. The next prime is 2130509. The reversal of 2130505 is 5050312.

2130505 = T₅₆₆ + T₅₆₇ + ... + T₅₇₈.

It can be written as a sum of positive squares in 8 ways, for example, as 65536 + 2064969 = 256^2 + 1437^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130505 - 2¹ = 2130503 is a prime.

It is an Ulam number.

2130505 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2130503) 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, 4521 + ... + 4969.

It is an arithmetic number, because the mean of its divisors is an integer number (174825).

2^2130505 is an apocalyptic number.

It is an amenable number.

2130505 is a deficient number, since it is larger than the sum of its proper divisors (666695).

2130505 is a wasteful number, since it uses less digits than its factorization.

2130505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 2130505 is about 1459.6249518284. The cubic root of 2130505 is about 128.6750026666.

Adding to 2130505 its reverse (5050312), we get a palindrome (7180817).

The spelling of 2130505 in words is "two million, one hundred thirty thousand, five hundred five".