16818960021 has 16 divisors (see below), whose sum is σ = 22913502720. Its totient is φ = 10970331120.

The previous prime is 16818959977. The next prime is 16818960061. The reversal of 16818960021 is 12006981861.

It is not a de Polignac number, because 16818960021 - 2¹⁵ = 16818927253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16818960061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187825 + ... + 262518.

It is an arithmetic number, because the mean of its divisors is an integer number (1432093920).

Almost surely, 2^16818960021 is an apocalyptic number.

It is an amenable number.

16818960021 is a deficient number, since it is larger than the sum of its proper divisors (6094542699).

16818960021 is a wasteful number, since it uses less digits than its factorization.

16818960021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450616.

The product of its (nonzero) digits is 41472, while the sum is 42.

The spelling of 16818960021 in words is "sixteen billion, eight hundred eighteen million, nine hundred sixty thousand, twenty-one".