85021621 has 8 divisors (see below), whose sum is σ = 87373440. Its totient is φ = 82686912.

The previous prime is 85021613. The next prime is 85021627. The reversal of 85021621 is 12612058.

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 85021621 - 2³ = 85021613 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 (85021627) 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 7 ways as a sum of consecutive naturals, for example, 6141 + ... + 14413.

It is an arithmetic number, because the mean of its divisors is an integer number (10921680).

Almost surely, 2^85021621 is an apocalyptic number.

It is an amenable number.

85021621 is a deficient number, since it is larger than the sum of its proper divisors (2351819).

85021621 is a wasteful number, since it uses less digits than its factorization.

85021621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8555.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 85021621 is about 9220.7169460948. The cubic root of 85021621 is about 439.7202439982.

Adding to 85021621 its reverse (12612058), we get a palindrome (97633679).

The spelling of 85021621 in words is "eighty-five million, twenty-one thousand, six hundred twenty-one".