248866021 has 4 divisors (see below), whose sum is σ = 249195532. Its totient is φ = 248536512.

The previous prime is 248865997. The next prime is 248866039. The reversal of 248866021 is 120668842.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61449921 + 187416100 = 7839^2 + 13690^2 .

It is a cyclic number.

It is not a de Polignac number, because 248866021 - 2²¹ = 246768869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248866091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163620 + ... + 165133.

It is an arithmetic number, because the mean of its divisors is an integer number (62298883).

Almost surely, 2^248866021 is an apocalyptic number.

It is an amenable number.

248866021 is a deficient number, since it is larger than the sum of its proper divisors (329511).

248866021 is an equidigital number, since it uses as much as digits as its factorization.

248866021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329510.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 248866021 is about 15775.4879797742. The cubic root of 248866021 is about 629.0065985054.

The spelling of 248866021 in words is "two hundred forty-eight million, eight hundred sixty-six thousand, twenty-one".