2422447721 has 2 divisors, whose sum is σ = 2422447722. Its totient is φ = 2422447720.

The previous prime is 2422447697. The next prime is 2422447723. The reversal of 2422447721 is 1277442242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2419557721 + 2890000 = 49189^2 + 1700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2422447721 is a prime.

Together with 2422447723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2422447723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1211223860 + 1211223861.

It is an arithmetic number, because the mean of its divisors is an integer number (1211223861).

Almost surely, 2^2422447721 is an apocalyptic number.

It is an amenable number.

2422447721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2422447721 is an equidigital number, since it uses as much as digits as its factorization.

2422447721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50176, while the sum is 35.

The square root of 2422447721 is about 49218.3677197853. The cubic root of 2422447721 is about 1343.0271876664.

Adding to 2422447721 its reverse (1277442242), we get a palindrome (3699889963).

The spelling of 2422447721 in words is "two billion, four hundred twenty-two million, four hundred forty-seven thousand, seven hundred twenty-one".