2221257679871 has 4 divisors (see below), whose sum is σ = 2351919896352. Its totient is φ = 2090595463392.

The previous prime is 2221257679867. The next prime is 2221257679877. The reversal of 2221257679871 is 1789767521222.

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 2221257679871 - 2² = 2221257679867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221257679871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221257679877) 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, 65331108215 + ... + 65331108248.

It is an arithmetic number, because the mean of its divisors is an integer number (587979974088).

Almost surely, 2^{2221257679871} is an apocalyptic number.

2221257679871 is a deficient number, since it is larger than the sum of its proper divisors (130662216481).

2221257679871 is a wasteful number, since it uses less digits than its factorization.

2221257679871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130662216480.

The product of its digits is 11854080, while the sum is 59.

The spelling of 2221257679871 in words is "two trillion, two hundred twenty-one billion, two hundred fifty-seven million, six hundred seventy-nine thousand, eight hundred seventy-one".