2445221 has 2 divisors, whose sum is σ = 2445222. Its totient is φ = 2445220.

The previous prime is 2445217. The next prime is 2445241. The reversal of 2445221 is 1225442.

It is a happy number.

It is an a-pointer prime, because the next prime (2445241) can be obtained adding 2445221 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1852321 + 592900 = 1361^2 + 770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2445221 - 2² = 2445217 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 2445193 and 2445202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2445211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1222610 + 1222611.

It is an arithmetic number, because the mean of its divisors is an integer number (1222611).

2^2445221 is an apocalyptic number.

It is an amenable number.

2445221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2445221 is an equidigital number, since it uses as much as digits as its factorization.

2445221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 20.

The square root of 2445221 is about 1563.7202435218. The cubic root of 2445221 is about 134.7222639380.

The spelling of 2445221 in words is "two million, four hundred forty-five thousand, two hundred twenty-one".