2133681 has 32 divisors (see below), whose sum is σ = 3386880. Its totient is φ = 1180800.

The previous prime is 2133673. The next prime is 2133683. The reversal of 2133681 is 1863312.

It is not a de Polignac number, because 2133681 - 2³ = 2133673 is a prime.

It is a super-2 number, since 2×2133681² = 9105189219522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2133683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25666 + ... + 25748.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2^2133681 is an apocalyptic number.

It is an amenable number.

2133681 is a deficient number, since it is larger than the sum of its proper divisors (1253199).

2133681 is a wasteful number, since it uses less digits than its factorization.

2133681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157.

The product of its digits is 864, while the sum is 24.

The square root of 2133681 is about 1460.7124973793. The cubic root of 2133681 is about 128.7389106608.

Adding to 2133681 its reverse (1863312), we get a palindrome (3996993).

The spelling of 2133681 in words is "two million, one hundred thirty-three thousand, six hundred eighty-one".