2642221 has 6 divisors (see below), whose sum is σ = 2706990. Its totient is φ = 2578968.

The previous prime is 2642203. The next prime is 2642231. The reversal of 2642221 is 1222462.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 978121 = 1290^2 + 989^2 .

It is not a de Polignac number, because 2642221 - 2¹⁷ = 2511149 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2642201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135 + ... + 2563.

It is an arithmetic number, because the mean of its divisors is an integer number (451165).

2^2642221 is an apocalyptic number.

It is an amenable number.

2642221 is a deficient number, since it is larger than the sum of its proper divisors (64769).

2642221 is an equidigital number, since it uses as much as digits as its factorization.

2642221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515 (or 1472 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 2642221 is about 1625.4910027435. The cubic root of 2642221 is about 138.2472114385.

Adding to 2642221 its reverse (1222462), we get a palindrome (3864683).

It can be divided in two parts, 264 and 2221, that added together give a triangular number (2485 = T₇₀).

The spelling of 2642221 in words is "two million, six hundred forty-two thousand, two hundred twenty-one".