21115496012 has 24 divisors (see below), whose sum is σ = 41524790496. Its totient is φ = 9321890688.

The previous prime is 21115496009. The next prime is 21115496027. The reversal of 21115496012 is 21069451112.

It is a self number, because there is not a number n which added to its sum of digits gives 21115496012.

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 7 ways as a sum of consecutive naturals, for example, 8826353 + ... + 8828744.

It is an arithmetic number, because the mean of its divisors is an integer number (1730199604).

Almost surely, 2^21115496012 is an apocalyptic number.

It is an amenable number.

21115496012 is a deficient number, since it is larger than the sum of its proper divisors (20409294484).

21115496012 is a wasteful number, since it uses less digits than its factorization.

21115496012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17655137 (or 17655135 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 21115496012 in words is "twenty-one billion, one hundred fifteen million, four hundred ninety-six thousand, twelve".