21115742272 has 28 divisors (see below), whose sum is σ = 41908689360. Its totient is φ = 10556072576.

The previous prime is 21115742261. The next prime is 21115742281. The reversal of 21115742272 is 27224751112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401403 + ... + 450949.

Almost surely, 2^21115742272 is an apocalyptic number.

It is an amenable number.

21115742272 is a deficient number, since it is larger than the sum of its proper divisors (20792947088).

21115742272 is an equidigital number, since it uses as much as digits as its factorization.

21115742272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56218 (or 56208 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The spelling of 21115742272 in words is "twenty-one billion, one hundred fifteen million, seven hundred forty-two thousand, two hundred seventy-two".