16421946828 has 240 divisors, whose sum is σ = 46589996544. Its totient is φ = 4498623360.

The previous prime is 16421946817. The next prime is 16421946857. The reversal of 16421946828 is 82864912461.

16421946828 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 90728898 + ... + 90729078.

Almost surely, 2^16421946828 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 16421946828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23294998272).

16421946828 is an abundant number, since it is smaller than the sum of its proper divisors (30168049716).

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

16421946828 is a wasteful number, since it uses less digits than its factorization.

16421946828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 307 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The spelling of 16421946828 in words is "sixteen billion, four hundred twenty-one million, nine hundred forty-six thousand, eight hundred twenty-eight".