2681221 has 4 divisors (see below), whose sum is σ = 2767744. Its totient is φ = 2594700.

The previous prime is 2681213. The next prime is 2681249. The reversal of 2681221 is 1221862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2681221 - 2³ = 2681213 is a prime.

It is a Duffinian number.

2681221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2681192 and 2681201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2681201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43215 + ... + 43276.

It is an arithmetic number, because the mean of its divisors is an integer number (691936).

2^2681221 is an apocalyptic number.

It is an amenable number.

2681221 is a deficient number, since it is larger than the sum of its proper divisors (86523).

2681221 is an equidigital number, since it uses as much as digits as its factorization.

2681221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86522.

The product of its digits is 384, while the sum is 22.

The square root of 2681221 is about 1637.4434341375. The cubic root of 2681221 is about 138.9240825540.

The spelling of 2681221 in words is "two million, six hundred eighty-one thousand, two hundred twenty-one".