21232424245 has 8 divisors (see below), whose sum is σ = 25496697816. Its totient is φ = 16974080256.

The previous prime is 21232424243. The next prime is 21232424251. The reversal of 21232424245 is 54242423212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9000506641 + 12231917604 = 94871^2 + 110598^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21232424245 - 2¹ = 21232424243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232424243) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1474512 + ... + 1488841.

It is an arithmetic number, because the mean of its divisors is an integer number (3187087227).

Almost surely, 2^21232424245 is an apocalyptic number.

It is an amenable number.

21232424245 is a deficient number, since it is larger than the sum of its proper divisors (4264273571).

21232424245 is a wasteful number, since it uses less digits than its factorization.

21232424245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964791.

The product of its digits is 30720, while the sum is 31.

Adding to 21232424245 its reverse (54242423212), we get a palindrome (75474847457).

The spelling of 21232424245 in words is "twenty-one billion, two hundred thirty-two million, four hundred twenty-four thousand, two hundred forty-five".