85842021 has 16 divisors (see below), whose sum is σ = 116025408. Its totient is φ = 56448000.

The previous prime is 85842011. The next prime is 85842037. The reversal of 85842021 is 12024858.

It is not a de Polignac number, because 85842021 - 2⁵ = 85841989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85842021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85842011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148485 + ... + 149061.

It is an arithmetic number, because the mean of its divisors is an integer number (7251588).

Almost surely, 2^85842021 is an apocalyptic number.

It is an amenable number.

85842021 is a deficient number, since it is larger than the sum of its proper divisors (30183387).

85842021 is a wasteful number, since it uses less digits than its factorization.

85842021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 85842021 is about 9265.0969234002. The cubic root of 85842021 is about 441.1300514727.

Adding to 85842021 its reverse (12024858), we get a palindrome (97866879).

The spelling of 85842021 in words is "eighty-five million, eight hundred forty-two thousand, twenty-one".