16221606912 has 528 divisors, whose sum is σ = 56747425280. Its totient is φ = 4532723712.

The previous prime is 16221606893. The next prime is 16221606937. The reversal of 16221606912 is 21960612261.

16221606912 is a `hidden beast` number, since 1 + 622 + 16 + 0 + 6 + 9 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116702139 + ... + 116702277.

Almost surely, 2^16221606912 is an apocalyptic number.

16221606912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16221606912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28373712640).

16221606912 is an abundant number, since it is smaller than the sum of its proper divisors (40525818368).

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

16221606912 is an equidigital number, since it uses as much as digits as its factorization.

16221606912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 16221606912 in words is "sixteen billion, two hundred twenty-one million, six hundred six thousand, nine hundred twelve".