21243434010 has 64 divisors (see below), whose sum is σ = 51574786560. Its totient is φ = 5599549440.

The previous prime is 21243433997. The next prime is 21243434011. The reversal of 21243434010 is 1043434212.

It is not an unprimeable number, because it can be changed into a prime (21243434011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1401834 + ... + 1416906.

It is an arithmetic number, because the mean of its divisors is an integer number (805856040).

Almost surely, 2^21243434010 is an apocalyptic number.

21243434010 is an abundant number, since it is smaller than the sum of its proper divisors (30331352550).

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

21243434010 is a wasteful number, since it uses less digits than its factorization.

21243434010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15623.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21243434010 its reverse (1043434212), we get a palindrome (22286868222).

The spelling of 21243434010 in words is "twenty-one billion, two hundred forty-three million, four hundred thirty-four thousand, ten".