2130681 has 16 divisors (see below), whose sum is σ = 3267968. Its totient is φ = 1209600.

The previous prime is 2130673. The next prime is 2130683. The reversal of 2130681 is 1860312.

It is not a de Polignac number, because 2130681 - 2³ = 2130673 is a prime.

It is a super-2 number, since 2×2130681² = 9079603047522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2130683) 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, 4851 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (204248).

2^2130681 is an apocalyptic number.

2130681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2130681 is a deficient number, since it is larger than the sum of its proper divisors (1137287).

2130681 is a wasteful number, since it uses less digits than its factorization.

2130681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2130681 is about 1459.6852400432. The cubic root of 2130681 is about 128.6785458292.

Adding to 2130681 its reverse (1860312), we get a palindrome (3990993).

The spelling of 2130681 in words is "two million, one hundred thirty thousand, six hundred eighty-one".