85424021 has 8 divisors (see below), whose sum is σ = 86332800. Its totient is φ = 84519648.

The previous prime is 85423999. The next prime is 85424023. The reversal of 85424021 is 12042458.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85424021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85424023) 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, 49430 + ... + 51128.

It is an arithmetic number, because the mean of its divisors is an integer number (10791600).

Almost surely, 2^85424021 is an apocalyptic number.

It is an amenable number.

85424021 is a deficient number, since it is larger than the sum of its proper divisors (908779).

85424021 is a wasteful number, since it uses less digits than its factorization.

85424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 85424021 is about 9242.5116175204. The cubic root of 85424021 is about 440.4128717602.

Adding to 85424021 its reverse (12042458), we get a palindrome (97466479).

The spelling of 85424021 in words is "eighty-five million, four hundred twenty-four thousand, twenty-one".