85567021 has 4 divisors (see below), whose sum is σ = 85590592. Its totient is φ = 85543452.

The previous prime is 85567007. The next prime is 85567039. The reversal of 85567021 is 12076558.

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 not a de Polignac number, because 85567021 - 2¹⁷ = 85435949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85562021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5061 + ... + 14026.

It is an arithmetic number, because the mean of its divisors is an integer number (21397648).

Almost surely, 2^85567021 is an apocalyptic number.

It is an amenable number.

85567021 is a deficient number, since it is larger than the sum of its proper divisors (23571).

85567021 is a wasteful number, since it uses less digits than its factorization.

85567021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23570.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 85567021 is about 9250.2443751503. The cubic root of 85567021 is about 440.6584854655.

It can be divided in two parts, 855 and 67021, that added together give a palindrome (67876).

The spelling of 85567021 in words is "eighty-five million, five hundred sixty-seven thousand, twenty-one".