2445647221 has 2 divisors, whose sum is σ = 2445647222. Its totient is φ = 2445647220.

The previous prime is 2445647213. The next prime is 2445647329. The reversal of 2445647221 is 1227465442.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1304220996 + 1141426225 = 36114^2 + 33785^2 .

It is a cyclic number.

It is not a de Polignac number, because 2445647221 - 2³ = 2445647213 is a prime.

It is a super-4 number, since 4×2445647221⁴ (a number of 39 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2445647521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1222823610 + 1222823611.

It is an arithmetic number, because the mean of its divisors is an integer number (1222823611).

Almost surely, 2^2445647221 is an apocalyptic number.

It is an amenable number.

2445647221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2445647221 is an equidigital number, since it uses as much as digits as its factorization.

2445647221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 37.

The square root of 2445647221 is about 49453.4854282284. The cubic root of 2445647221 is about 1347.3009119532.

It can be divided in two parts, 244 and 5647221, that added together give a palindrome (5647465).

The spelling of 2445647221 in words is "two billion, four hundred forty-five million, six hundred forty-seven thousand, two hundred twenty-one".