16221143616 has 28 divisors (see below), whose sum is σ = 42918442992. Its totient is φ = 5407047808.

The previous prime is 16221143597. The next prime is 16221143629. The reversal of 16221143616 is 61634112261.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42242370 + ... + 42242753.

Almost surely, 2^16221143616 is an apocalyptic number.

16221143616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16221143616 is an abundant number, since it is smaller than the sum of its proper divisors (26697299376).

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

16221143616 is an equidigital number, since it uses as much as digits as its factorization.

16221143616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84485138 (or 84485128 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

Adding to 16221143616 its reverse (61634112261), we get a palindrome (77855255877).

The spelling of 16221143616 in words is "sixteen billion, two hundred twenty-one million, one hundred forty-three thousand, six hundred sixteen".