2560021 has 2 divisors, whose sum is σ = 2560022.
Its totient is φ = 2560020.
The previous prime is 2559989. The next prime is 2560031. The reversal of 2560021 is 1200652.
Adding to 2560021 its reverse (1200652), we get a palindrome (3760673).
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1380625 + 1179396 = 1175^2 + 1086^2
It is a cyclic number.
It is not a de Polignac number, because 2560021 - 25 = 2559989 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 2559977 and 2560004.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2560031) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280010 + 1280011.
It is an arithmetic number, because the mean of its divisors is an integer number (1280011).
22560021 is an apocalyptic number.
It is an amenable number.
2560021 is a deficient number, since it is larger than the sum of its proper divisors (1).
2560021 is an equidigital number, since it uses as much as digits as its factorization.
2560021 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 120, while the sum is 16.
The square root of 2560021 is about 1600.0065624865.
The cubic root of 2560021 is about 136.7984497904.
The spelling of 2560021 in words is "two million, five hundred sixty thousand, twenty-one".