21002312230 has 32 divisors (see below), whose sum is σ = 39485880000. Its totient is φ = 8027914752.

The previous prime is 21002312203. The next prime is 21002312239. The reversal of 21002312230 is 3221320012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002312239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197746 + ... + 284794.

It is an arithmetic number, because the mean of its divisors is an integer number (1233933750).

Almost surely, 2^21002312230 is an apocalyptic number.

21002312230 is a deficient number, since it is larger than the sum of its proper divisors (18483567770).

21002312230 is a wasteful number, since it uses less digits than its factorization.

21002312230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88128.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002312230 its reverse (3221320012), we get a palindrome (24223632242).

The spelling of 21002312230 in words is "twenty-one billion, two million, three hundred twelve thousand, two hundred thirty".