85516409027221 has 16 divisors (see below), whose sum is σ = 89486900841600. Its totient is φ = 81633319604928.

The previous prime is 85516409027219. The next prime is 85516409027237. The reversal of 85516409027221 is 12272090461558.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 85516409027221 - 2¹ = 85516409027219 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 (85516409028221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86338690 + ... + 87323548.

It is an arithmetic number, because the mean of its divisors is an integer number (5592931302600).

Almost surely, 2^{85516409027221} is an apocalyptic number.

It is an amenable number.

85516409027221 is a deficient number, since it is larger than the sum of its proper divisors (3970491814379).

85516409027221 is a wasteful number, since it uses less digits than its factorization.

85516409027221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029228.

The product of its (nonzero) digits is 2419200, while the sum is 52.

Adding to 85516409027221 its reverse (12272090461558), we get a palindrome (97788499488779).

The spelling of 85516409027221 in words is "eighty-five trillion, five hundred sixteen billion, four hundred nine million, twenty-seven thousand, two hundred twenty-one".