85420135221 has 8 divisors (see below), whose sum is σ = 114313785984. Its totient is φ = 56736620640.

The previous prime is 85420135193. The next prime is 85420135237. The reversal of 85420135221 is 12253102458.

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

It is not a de Polignac number, because 85420135221 - 2¹⁰ = 85420134197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85420135261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52533096 + ... + 52534721.

It is an arithmetic number, because the mean of its divisors is an integer number (14289223248).

Almost surely, 2^85420135221 is an apocalyptic number.

It is an amenable number.

85420135221 is a deficient number, since it is larger than the sum of its proper divisors (28893650763).

85420135221 is a wasteful number, since it uses less digits than its factorization.

85420135221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105068091.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 85420135221 its reverse (12253102458), we get a palindrome (97673237679).

The spelling of 85420135221 in words is "eighty-five billion, four hundred twenty million, one hundred thirty-five thousand, two hundred twenty-one".