68047844221 has 4 divisors (see below), whose sum is σ = 77768964832. Its totient is φ = 58326723612.

The previous prime is 68047844167. The next prime is 68047844251. The reversal of 68047844221 is 12244874086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68047844221 - 2¹³ = 68047836029 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 (68047844251) 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, 4860560295 + ... + 4860560308.

It is an arithmetic number, because the mean of its divisors is an integer number (19442241208).

Almost surely, 2^68047844221 is an apocalyptic number.

It is an amenable number.

68047844221 is a deficient number, since it is larger than the sum of its proper divisors (9721120611).

68047844221 is an equidigital number, since it uses as much as digits as its factorization.

68047844221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9721120610.

The product of its (nonzero) digits is 688128, while the sum is 46.

The spelling of 68047844221 in words is "sixty-eight billion, forty-seven million, eight hundred forty-four thousand, two hundred twenty-one".