248021 has 2 divisors, whose sum is σ = 248022. Its totient is φ = 248020.

The previous prime is 247999. The next prime is 248033. The reversal of 248021 is 120842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240100 + 7921 = 490^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 248021 - 2⁶ = 247957 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 248021.

It is not a weakly prime, because it can be changed into another prime (248041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124010 + 124011.

It is an arithmetic number, because the mean of its divisors is an integer number (124011).

2²⁴⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

248021 is a deficient number, since it is larger than the sum of its proper divisors (1).

248021 is an equidigital number, since it uses as much as digits as its factorization.

248021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 248021 is about 498.0170679806. The cubic root of 248021 is about 62.8293863578.

Subtracting from 248021 its sum of digits (17), we obtain a square (248004 = 498²).

Adding to 248021 its reverse (120842), we get a palindrome (368863).

The spelling of 248021 in words is "two hundred forty-eight thousand, twenty-one".