71779004201221 has 8 divisors (see below), whose sum is σ = 71812438709760. Its totient is φ = 71745570925728.

The previous prime is 71779004201183. The next prime is 71779004201227. The reversal of 71779004201221 is 12210240097717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71779004201221 - 2¹¹ = 71779004199173 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 (71779004201227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128658945 + ... + 129215641.

It is an arithmetic number, because the mean of its divisors is an integer number (8976554838720).

Almost surely, 2^{71779004201221} is an apocalyptic number.

It is an amenable number.

71779004201221 is a deficient number, since it is larger than the sum of its proper divisors (33434508539).

71779004201221 is a wasteful number, since it uses less digits than its factorization.

71779004201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616523.

The product of its (nonzero) digits is 98784, while the sum is 43.

Adding to 71779004201221 its reverse (12210240097717), we get a palindrome (83989244298938).

The spelling of 71779004201221 in words is "seventy-one trillion, seven hundred seventy-nine billion, four million, two hundred one thousand, two hundred twenty-one".