2540221 has 4 divisors (see below), whose sum is σ = 2559744. Its totient is φ = 2520700.

The previous prime is 2540203. The next prime is 2540231. The reversal of 2540221 is 1220452.

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 a cyclic number.

It is not a de Polignac number, because 2540221 - 2⁷ = 2540093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2540195 and 2540204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540201) 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, 9565 + ... + 9826.

It is an arithmetic number, because the mean of its divisors is an integer number (639936).

2^2540221 is an apocalyptic number.

It is an amenable number.

2540221 is a deficient number, since it is larger than the sum of its proper divisors (19523).

2540221 is a wasteful number, since it uses less digits than its factorization.

2540221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19522.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2540221 is about 1593.8070774093. The cubic root of 2540221 is about 136.4448560057. Note that the first 3 decimals are identical.

Adding to 2540221 its reverse (1220452), we get a palindrome (3760673).

The spelling of 2540221 in words is "two million, five hundred forty thousand, two hundred twenty-one".