2681921 has 8 divisors (see below), whose sum is σ = 2937600. Its totient is φ = 2428240.

The previous prime is 2681897. The next prime is 2681927. The reversal of 2681921 is 1291862.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2681921 - 2⁶ = 2681857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2681927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5015 + ... + 5523.

It is an arithmetic number, because the mean of its divisors is an integer number (367200).

2^2681921 is an apocalyptic number.

It is an amenable number.

2681921 is a deficient number, since it is larger than the sum of its proper divisors (255679).

2681921 is a wasteful number, since it uses less digits than its factorization.

2681921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999.

The product of its digits is 1728, while the sum is 29.

The square root of 2681921 is about 1637.6571680300. The cubic root of 2681921 is about 138.9361713742.

The spelling of 2681921 in words is "two million, six hundred eighty-one thousand, nine hundred twenty-one".