2456021 has 2 divisors, whose sum is σ = 2456022. Its totient is φ = 2456020.

The previous prime is 2456011. The next prime is 2456029. The reversal of 2456021 is 1206542.

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., 1876900 + 579121 = 1370^2 + 761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2456021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2455984 and 2456002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2456029) 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, 1228010 + 1228011.

It is an arithmetic number, because the mean of its divisors is an integer number (1228011).

2^2456021 is an apocalyptic number.

It is an amenable number.

2456021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2456021 is an equidigital number, since it uses as much as digits as its factorization.

2456021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2456021 is about 1567.1697419233. The cubic root of 2456021 is about 134.9203187768.

The spelling of 2456021 in words is "two million, four hundred fifty-six thousand, twenty-one".