21470085 has 96 divisors (see below), whose sum is σ = 47174400. Its totient is φ = 8975232.

The previous prime is 21470081. The next prime is 21470123. The reversal of 21470085 is 58007412.

It is not a de Polignac number, because 21470085 - 2² = 21470081 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470081) 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 95 ways as a sum of consecutive naturals, for example, 200602 + ... + 200708.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^21470085 is an apocalyptic number.

It is an amenable number.

21470085 is an abundant number, since it is smaller than the sum of its proper divisors (25704315).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21470085 is a wasteful number, since it uses less digits than its factorization.

21470085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 21470085 is about 4633.5823074593. The cubic root of 21470085 is about 277.9358624014.

Adding to 21470085 its reverse (58007412), we get a palindrome (79477497).

The spelling of 21470085 in words is "twenty-one million, four hundred seventy thousand, eighty-five".