21085000230 has 64 divisors (see below), whose sum is σ = 57844689408. Its totient is φ = 4818466560.

The previous prime is 21085000199. The next prime is 21085000241. The reversal of 21085000230 is 3200058012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21085000197 and 21085000206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2059825 + ... + 2070035.

It is an arithmetic number, because the mean of its divisors is an integer number (903823272).

Almost surely, 2^21085000230 is an apocalyptic number.

21085000230 is an abundant number, since it is smaller than the sum of its proper divisors (36759689178).

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

21085000230 is a wasteful number, since it uses less digits than its factorization.

21085000230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20061.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21085000230 its reverse (3200058012), we get a palindrome (24285058242).

The spelling of 21085000230 in words is "twenty-one billion, eighty-five million, two hundred thirty", and thus it is an aban number.