21242404330 has 16 divisors (see below), whose sum is σ = 43698660480. Its totient is φ = 7283110032.

The previous prime is 21242404321. The next prime is 21242404333. The reversal of 21242404330 is 3340424212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21242404295 and 21242404304.

It is not an unprimeable number, because it can be changed into a prime (21242404333) 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, 151731390 + ... + 151731529.

It is an arithmetic number, because the mean of its divisors is an integer number (2731166280).

Almost surely, 2^21242404330 is an apocalyptic number.

21242404330 is an abundant number, since it is smaller than the sum of its proper divisors (22456256150).

21242404330 is a wasteful number, since it uses less digits than its factorization.

21242404330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303462933.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21242404330 its reverse (3340424212), we get a palindrome (24582828542).

The spelling of 21242404330 in words is "twenty-one billion, two hundred forty-two million, four hundred four thousand, three hundred thirty".