21023440230 has 64 divisors (see below), whose sum is σ = 55148583168. Its totient is φ = 5097755520.

The previous prime is 21023440223. The next prime is 21023440247. The reversal of 21023440230 is 3204432012.

It is a junction number, because it is equal to n+sod(n) for n = 21023440197 and 21023440206.

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 31 ways as a sum of consecutive naturals, for example, 376156 + ... + 428415.

It is an arithmetic number, because the mean of its divisors is an integer number (861696612).

Almost surely, 2^21023440230 is an apocalyptic number.

21023440230 is an abundant number, since it is smaller than the sum of its proper divisors (34125142938).

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

21023440230 is a wasteful number, since it uses less digits than its factorization.

21023440230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804661.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21023440230 its reverse (3204432012), we get a palindrome (24227872242).

The spelling of 21023440230 in words is "twenty-one billion, twenty-three million, four hundred forty thousand, two hundred thirty".