21320413242 has 16 divisors (see below), whose sum is σ = 42644390112. Its totient is φ = 7106210480.

The previous prime is 21320413229. The next prime is 21320413243. The reversal of 21320413242 is 24231402312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21320413243) 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 7 ways as a sum of consecutive naturals, for example, 67293 + ... + 217184.

It is an arithmetic number, because the mean of its divisors is an integer number (2665274382).

Almost surely, 2^21320413242 is an apocalyptic number.

21320413242 is an abundant number, since it is smaller than the sum of its proper divisors (21323976870).

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

21320413242 is a wasteful number, since it uses less digits than its factorization.

21320413242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296973.

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

Adding to 21320413242 its reverse (24231402312), we get a palindrome (45551815554).

The spelling of 21320413242 in words is "twenty-one billion, three hundred twenty million, four hundred thirteen thousand, two hundred forty-two".