221115287071 has 12 divisors (see below), whose sum is σ = 257276977488. Its totient is φ = 189482268192.

The previous prime is 221115287069. The next prime is 221115287077. The reversal of 221115287071 is 170782511122.

It is a happy number.

It is not a de Polignac number, because 221115287071 - 2¹ = 221115287069 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 221115287071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221115287077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328411 + ... + 741676.

It is an arithmetic number, because the mean of its divisors is an integer number (21439748124).

Almost surely, 2^221115287071 is an apocalyptic number.

221115287071 is a deficient number, since it is larger than the sum of its proper divisors (36161690417).

221115287071 is a wasteful number, since it uses less digits than its factorization.

221115287071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074318 (or 1074311 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 37.

Adding to 221115287071 its reverse (170782511122), we get a palindrome (391897798193).

The spelling of 221115287071 in words is "two hundred twenty-one billion, one hundred fifteen million, two hundred eighty-seven thousand, seventy-one".