21323043242 has 16 divisors (see below), whose sum is σ = 32927459040. Its totient is φ = 10348599888.

The previous prime is 21323043241. The next prime is 21323043299. The reversal of 21323043242 is 24234032312.

It is not an unprimeable number, because it can be changed into a prime (21323043241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312848 + ... + 374859.

It is an arithmetic number, because the mean of its divisors is an integer number (2057966190).

Almost surely, 2^21323043242 is an apocalyptic number.

21323043242 is a deficient number, since it is larger than the sum of its proper divisors (11604415798).

21323043242 is a wasteful number, since it uses less digits than its factorization.

21323043242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688165.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21323043242 its reverse (24234032312), we get a palindrome (45557075554).

The spelling of 21323043242 in words is "twenty-one billion, three hundred twenty-three million, forty-three thousand, two hundred forty-two".