2421997 has 2 divisors, whose sum is σ = 2421998. Its totient is φ = 2421996.

The previous prime is 2421989. The next prime is 2422027. The reversal of 2421997 is 7991242.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2223081 + 198916 = 1491^2 + 446^2 .

2421997 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 2421997 - 2³ = 2421989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2421907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210998 + 1210999.

It is an arithmetic number, because the mean of its divisors is an integer number (1210999).

2^2421997 is an apocalyptic number.

It is an amenable number.

2421997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421997 is an equidigital number, since it uses as much as digits as its factorization.

2421997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 2421997 is about 1556.2766463582. The cubic root of 2421997 is about 134.2943887884.

The spelling of 2421997 in words is "two million, four hundred twenty-one thousand, nine hundred ninety-seven".