85221217790 has 8 divisors (see below), whose sum is σ = 153398192040. Its totient is φ = 34088487112.

The previous prime is 85221217789. The next prime is 85221217793. The reversal of 85221217790 is 9771212258.

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

It is a super-2 number, since 2×85221217790² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85221217793) 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 3 ways as a sum of consecutive naturals, for example, 4261060880 + ... + 4261060899.

It is an arithmetic number, because the mean of its divisors is an integer number (19174774005).

Almost surely, 2^85221217790 is an apocalyptic number.

85221217790 is a deficient number, since it is larger than the sum of its proper divisors (68176974250).

85221217790 is a wasteful number, since it uses less digits than its factorization.

85221217790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8522121786.

The product of its (nonzero) digits is 141120, while the sum is 44.

The spelling of 85221217790 in words is "eighty-five billion, two hundred twenty-one million, two hundred seventeen thousand, seven hundred ninety".