85005867921 has 8 divisors (see below), whose sum is σ = 122059707840. Its totient is φ = 52311303312.

The previous prime is 85005867913. The next prime is 85005867971. The reversal of 85005867921 is 12976850058.

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

It is not a de Polignac number, because 85005867921 - 2³ = 85005867913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85005867971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089818781 + ... + 1089818858.

It is an arithmetic number, because the mean of its divisors is an integer number (15257463480).

Almost surely, 2^85005867921 is an apocalyptic number.

It is an amenable number.

85005867921 is a deficient number, since it is larger than the sum of its proper divisors (37053839919).

85005867921 is a wasteful number, since it uses less digits than its factorization.

85005867921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179637655.

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 85005867921 in words is "eighty-five billion, five million, eight hundred sixty-seven thousand, nine hundred twenty-one".