248021721287 has 4 divisors (see below), whose sum is σ = 248054531616. Its totient is φ = 247988910960.

The previous prime is 248021721229. The next prime is 248021721313. The reversal of 248021721287 is 782127120842.

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

It is a cyclic number.

It is not a de Polignac number, because 248021721287 - 2¹⁰ = 248021720263 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 (248021121287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16393823 + ... + 16408944.

It is an arithmetic number, because the mean of its divisors is an integer number (62013632904).

Almost surely, 2^248021721287 is an apocalyptic number.

248021721287 is a deficient number, since it is larger than the sum of its proper divisors (32810329).

248021721287 is an equidigital number, since it uses as much as digits as its factorization.

248021721287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32810328.

The product of its (nonzero) digits is 200704, while the sum is 44.

The spelling of 248021721287 in words is "two hundred forty-eight billion, twenty-one million, seven hundred twenty-one thousand, two hundred eighty-seven".