2171827428881 has 8 divisors (see below), whose sum is σ = 2369392556544. Its totient is φ = 1974283346320.

The previous prime is 2171827428871. The next prime is 2171827428917. The reversal of 2171827428881 is 1888247281712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171827428881 is a prime.

It is a super-2 number, since 2×2171827428881² (a number of 25 digits) contains 22 as substring.

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 2171827428881.

It is not an unprimeable number, because it can be changed into a prime (2171827428871) 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 7 ways as a sum of consecutive naturals, for example, 5045105 + ... + 5458638.

It is an arithmetic number, because the mean of its divisors is an integer number (296174069568).

Almost surely, 2^{2171827428881} is an apocalyptic number.

It is an amenable number.

2171827428881 is a deficient number, since it is larger than the sum of its proper divisors (197565127663).

2171827428881 is a wasteful number, since it uses less digits than its factorization.

2171827428881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10522551.

The product of its digits is 6422528, while the sum is 59.

The spelling of 2171827428881 in words is "two trillion, one hundred seventy-one billion, eight hundred twenty-seven million, four hundred twenty-eight thousand, eight hundred eighty-one".