21324240154 has 16 divisors (see below), whose sum is σ = 37816387200. Its totient is φ = 8823823344.

The previous prime is 21324240089. The next prime is 21324240193. The reversal of 21324240154 is 45104242312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26260974 + ... + 26261785.

It is an arithmetic number, because the mean of its divisors is an integer number (2363524200).

Almost surely, 2^21324240154 is an apocalyptic number.

21324240154 is a deficient number, since it is larger than the sum of its proper divisors (16492147046).

21324240154 is a wasteful number, since it uses less digits than its factorization.

21324240154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52522797.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21324240154 its reverse (45104242312), we get a palindrome (66428482466).

The spelling of 21324240154 in words is "twenty-one billion, three hundred twenty-four million, two hundred forty thousand, one hundred fifty-four".