67727271221 has 4 divisors (see below), whose sum is σ = 68025629472. Its totient is φ = 67428912972.

The previous prime is 67727271203. The next prime is 67727271229. The reversal of 67727271221 is 12217272776.

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 a de Polignac number, because none of the positive numbers 2^k-67727271221 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 (67727271229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149178785 + ... + 149179238.

It is an arithmetic number, because the mean of its divisors is an integer number (17006407368).

Almost surely, 2^67727271221 is an apocalyptic number.

It is an amenable number.

67727271221 is a deficient number, since it is larger than the sum of its proper divisors (298358251).

67727271221 is a wasteful number, since it uses less digits than its factorization.

67727271221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298358250.

The product of its digits is 230496, while the sum is 44.

The spelling of 67727271221 in words is "sixty-seven billion, seven hundred twenty-seven million, two hundred seventy-one thousand, two hundred twenty-one".