21118034016 has 192 divisors, whose sum is σ = 65488227840. Its totient is φ = 6605913600.

The previous prime is 21118033997. The next prime is 21118034099. The reversal of 21118034016 is 61043081112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 1043191 + ... + 1063241.

It is an arithmetic number, because the mean of its divisors is an integer number (341084520).

Almost surely, 2^21118034016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21118034016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32744113920).

21118034016 is an abundant number, since it is smaller than the sum of its proper divisors (44370193824).

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

21118034016 is a wasteful number, since it uses less digits than its factorization.

21118034016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20146 (or 20132 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 21118034016 in words is "twenty-one billion, one hundred eighteen million, thirty-four thousand, sixteen".