85030816921 has 4 divisors (see below), whose sum is σ = 85047498000. Its totient is φ = 85014135844.

The previous prime is 85030816909. The next prime is 85030816931. The reversal of 85030816921 is 12961803058.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85030816921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85030816931) 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 3 ways as a sum of consecutive naturals, for example, 8332891 + ... + 8343088.

It is an arithmetic number, because the mean of its divisors is an integer number (21261874500).

Almost surely, 2^85030816921 is an apocalyptic number.

It is an amenable number.

85030816921 is a deficient number, since it is larger than the sum of its proper divisors (16681079).

85030816921 is a wasteful number, since it uses less digits than its factorization.

85030816921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16681078.

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 85030816921 in words is "eighty-five billion, thirty million, eight hundred sixteen thousand, nine hundred twenty-one".