2287421 has 2 divisors, whose sum is σ = 2287422. Its totient is φ = 2287420.

The previous prime is 2287409. The next prime is 2287423. The reversal of 2287421 is 1247822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1452025 + 835396 = 1205^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2287421 - 2¹⁴ = 2271037 is a prime.

Together with 2287423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2287423) 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, 1143710 + 1143711.

It is an arithmetic number, because the mean of its divisors is an integer number (1143711).

2^2287421 is an apocalyptic number.

It is an amenable number.

2287421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2287421 is an equidigital number, since it uses as much as digits as its factorization.

2287421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 26.

The square root of 2287421 is about 1512.4222294055. The cubic root of 2287421 is about 131.7595292842.

The spelling of 2287421 in words is "two million, two hundred eighty-seven thousand, four hundred twenty-one".