16221013776 has 80 divisors (see below), whose sum is σ = 50793088320. Its totient is φ = 4915457280.

The previous prime is 16221013769. The next prime is 16221013807. The reversal of 16221013776 is 67731012261.

It is a happy number.

16221013776 is a `hidden beast` number, since 1 + 622 + 10 + 13 + 7 + 7 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 16221013776.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1702005 + ... + 1711508.

It is an arithmetic number, because the mean of its divisors is an integer number (634913604).

Almost surely, 2^16221013776 is an apocalyptic number.

16221013776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16221013776 is an abundant number, since it is smaller than the sum of its proper divisors (34572074544).

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

16221013776 is a wasteful number, since it uses less digits than its factorization.

16221013776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413541 (or 3413529 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The spelling of 16221013776 in words is "sixteen billion, two hundred twenty-one million, thirteen thousand, seven hundred seventy-six".