21115402324 has 12 divisors (see below), whose sum is σ = 37811302144. Its totient is φ = 10312173144.

The previous prime is 21115402277. The next prime is 21115402327. The reversal of 21115402324 is 42320451112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115402327) 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 3 ways as a sum of consecutive naturals, for example, 61381812 + ... + 61382155.

Almost surely, 2^21115402324 is an apocalyptic number.

It is an amenable number.

21115402324 is a deficient number, since it is larger than the sum of its proper divisors (16695899820).

21115402324 is a wasteful number, since it uses less digits than its factorization.

21115402324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122764014 (or 122764012 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21115402324 its reverse (42320451112), we get a palindrome (63435853436).

The spelling of 21115402324 in words is "twenty-one billion, one hundred fifteen million, four hundred two thousand, three hundred twenty-four".