16403411021 has 16 divisors (see below), whose sum is σ = 17585694720. Its totient is φ = 15271597440.

The previous prime is 16403410901. The next prime is 16403411029. The reversal of 16403411021 is 12011430461.

It is a cyclic number.

It is not a de Polignac number, because 16403411021 - 2³⁰ = 15329669197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16403411029) 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, 21740 + ... + 182426.

It is an arithmetic number, because the mean of its divisors is an integer number (1099105920).

Almost surely, 2^16403411021 is an apocalyptic number.

It is an amenable number.

16403411021 is a deficient number, since it is larger than the sum of its proper divisors (1182283699).

16403411021 is a wasteful number, since it uses less digits than its factorization.

16403411021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160844.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 16403411021 its reverse (12011430461), we get a palindrome (28414841482).

The spelling of 16403411021 in words is "sixteen billion, four hundred three million, four hundred eleven thousand, twenty-one".