2447021 has 2 divisors, whose sum is σ = 2447022. Its totient is φ = 2447020.

The previous prime is 2447009. The next prime is 2447023. The reversal of 2447021 is 1207442.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2402500 + 44521 = 1550^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2447021 - 2¹⁸ = 2184877 is a prime.

Together with 2447023, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 2446984 and 2447002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2447023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1223510 + 1223511.

It is an arithmetic number, because the mean of its divisors is an integer number (1223511).

2^2447021 is an apocalyptic number.

It is an amenable number.

2447021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2447021 is an equidigital number, since it uses as much as digits as its factorization.

2447021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 2447021 is about 1564.2956881613. The cubic root of 2447021 is about 134.7553135199.

The spelling of 2447021 in words is "two million, four hundred forty-seven thousand, twenty-one".