248221021 has 2 divisors, whose sum is σ = 248221022. Its totient is φ = 248221020.

The previous prime is 248221009. The next prime is 248221031. The reversal of 248221021 is 120122842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245705625 + 2515396 = 15675^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 248221021 - 2⁵ = 248220989 is a prime.

It is a super-2 number, since 2×248221021² = 123227350532564882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 248220983 and 248221001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124110510 + 124110511.

It is an arithmetic number, because the mean of its divisors is an integer number (124110511).

Almost surely, 2^248221021 is an apocalyptic number.

It is an amenable number.

248221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

248221021 is an equidigital number, since it uses as much as digits as its factorization.

248221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 248221021 is about 15755.0316089813. The cubic root of 248221021 is about 628.4627178265.

Adding to 248221021 its reverse (120122842), we get a palindrome (368343863).

The spelling of 248221021 in words is "two hundred forty-eight million, two hundred twenty-one thousand, twenty-one".