2406442721 has 2 divisors, whose sum is σ = 2406442722. Its totient is φ = 2406442720.

The previous prime is 2406442691. The next prime is 2406442771. The reversal of 2406442721 is 1272446042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1573312225 + 833130496 = 39665^2 + 28864^2 .

It is a cyclic number.

It is not a de Polignac number, because 2406442721 - 2⁶ = 2406442657 is a prime.

It is not a weakly prime, because it can be changed into another prime (2406442771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1203221360 + 1203221361.

It is an arithmetic number, because the mean of its divisors is an integer number (1203221361).

Almost surely, 2^2406442721 is an apocalyptic number.

It is an amenable number.

2406442721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2406442721 is an equidigital number, since it uses as much as digits as its factorization.

2406442721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 2406442721 is about 49055.5065308677. The cubic root of 2406442721 is about 1340.0628768669.

Adding to 2406442721 its reverse (1272446042), we get a palindrome (3678888763).

The spelling of 2406442721 in words is "two billion, four hundred six million, four hundred forty-two thousand, seven hundred twenty-one".