21072115011016 has 16 divisors (see below), whose sum is σ = 39510266842800. Its totient is φ = 10536043852944.

The previous prime is 21072115010977. The next prime is 21072115011047. The reversal of 21072115011016 is 61011051127012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8314615 + ... + 10548793.

It is an arithmetic number, because the mean of its divisors is an integer number (2469391677675).

Almost surely, 2^{21072115011016} is an apocalyptic number.

It is an amenable number.

21072115011016 is a deficient number, since it is larger than the sum of its proper divisors (18438151831784).

21072115011016 is a wasteful number, since it uses less digits than its factorization.

21072115011016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413148 (or 3413144 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 28.

Adding to 21072115011016 its reverse (61011051127012), we get a palindrome (82083166138028).

The spelling of 21072115011016 in words is "twenty-one trillion, seventy-two billion, one hundred fifteen million, eleven thousand, sixteen".