16421144208 has 320 divisors, whose sum is σ = 51734784000. Its totient is φ = 4480842240.

The previous prime is 16421144197. The next prime is 16421144227. The reversal of 16421144208 is 80244112461.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77825223 + ... + 77825433.

It is an arithmetic number, because the mean of its divisors is an integer number (161671200).

Almost surely, 2^16421144208 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 16421144208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25867392000).

16421144208 is an abundant number, since it is smaller than the sum of its proper divisors (35313639792).

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

16421144208 is a wasteful number, since it uses less digits than its factorization.

16421144208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

Adding to 16421144208 its reverse (80244112461), we get a palindrome (96665256669).

The spelling of 16421144208 in words is "sixteen billion, four hundred twenty-one million, one hundred forty-four thousand, two hundred eight".