16221433820 has 12 divisors (see below), whose sum is σ = 34065011064. Its totient is φ = 6488573520.

The previous prime is 16221433793. The next prime is 16221433867. The reversal of 16221433820 is 2833412261.

It is a congruent number.

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, 405535826 + ... + 405535865.

It is an arithmetic number, because the mean of its divisors is an integer number (2838750922).

Almost surely, 2^16221433820 is an apocalyptic number.

16221433820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16221433820 is an abundant number, since it is smaller than the sum of its proper divisors (17843577244).

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

16221433820 is a wasteful number, since it uses less digits than its factorization.

16221433820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811071700 (or 811071698 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 16221433820 in words is "sixteen billion, two hundred twenty-one million, four hundred thirty-three thousand, eight hundred twenty".