85500021 has 8 divisors (see below), whose sum is σ = 120705984. Its totient is φ = 53647040.

The previous prime is 85500011. The next prime is 85500029. The reversal of 85500021 is 12000558.

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

It is a cyclic number.

It is not a de Polignac number, because 85500021 - 2⁶ = 85499957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85500029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 838185 + ... + 838286.

It is an arithmetic number, because the mean of its divisors is an integer number (15088248).

Almost surely, 2^85500021 is an apocalyptic number.

It is an amenable number.

85500021 is a deficient number, since it is larger than the sum of its proper divisors (35205963).

85500021 is a wasteful number, since it uses less digits than its factorization.

85500021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676491.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 85500021 is about 9246.6221400033. The cubic root of 85500021 is about 440.5434418134.

Adding to 85500021 its reverse (12000558), we get a palindrome (97500579).

The spelling of 85500021 in words is "eighty-five million, five hundred thousand, twenty-one".