21115002244 has 12 divisors (see below), whose sum is σ = 42230004544. Its totient is φ = 9049286664.

The previous prime is 21115002143. The next prime is 21115002287. The reversal of 21115002244 is 44220051112.

21115002244 is an admirable number.

It is an unprimeable number.

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, 377053584 + ... + 377053639.

Almost surely, 2^21115002244 is an apocalyptic number.

It is an amenable number.

21115002244 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21115002244 is a wasteful number, since it uses less digits than its factorization.

21115002244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754107234 (or 754107232 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21115002244 its reverse (44220051112), we get a palindrome (65335053356).

The spelling of 21115002244 in words is "twenty-one billion, one hundred fifteen million, two thousand, two hundred forty-four".