21001000230 has 48 divisors (see below), whose sum is σ = 62402973984. Its totient is φ = 4800228480.

The previous prime is 21001000213. The next prime is 21001000253. The reversal of 21001000230 is 3200010012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16666831 + ... + 16668090.

It is an arithmetic number, because the mean of its divisors is an integer number (1300061958).

Almost surely, 2^21001000230 is an apocalyptic number.

21001000230 is an abundant number, since it is smaller than the sum of its proper divisors (41401973754).

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

21001000230 is a wasteful number, since it uses less digits than its factorization.

21001000230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33334941 (or 33334938 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21001000230 its reverse (3200010012), we get a palindrome (24201010242).

The spelling of 21001000230 in words is "twenty-one billion, one million, two hundred thirty", and thus it is an aban number.