21118034015 has 32 divisors (see below), whose sum is σ = 28967621760. Its totient is φ = 14641311744.

The previous prime is 21118033997. The next prime is 21118034099. The reversal of 21118034015 is 51043081112.

It is a de Polignac number, because none of the positive numbers 2^k-21118034015 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 428582 + ... + 475308.

It is an arithmetic number, because the mean of its divisors is an integer number (905238180).

Almost surely, 2^21118034015 is an apocalyptic number.

21118034015 is a deficient number, since it is larger than the sum of its proper divisors (7849587745).

21118034015 is a wasteful number, since it uses less digits than its factorization.

21118034015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47171.

The product of its (nonzero) digits is 960, while the sum is 26.

The spelling of 21118034015 in words is "twenty-one billion, one hundred eighteen million, thirty-four thousand, fifteen".