16221785880 has 32 divisors (see below), whose sum is σ = 48665358000. Its totient is φ = 4325809536.

The previous prime is 16221785837. The next prime is 16221785887. The reversal of 16221785880 is 8858712261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221785887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67590655 + ... + 67590894.

Almost surely, 2^16221785880 is an apocalyptic number.

16221785880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16221785880 is an abundant number, since it is smaller than the sum of its proper divisors (32443572120).

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

16221785880 is a wasteful number, since it uses less digits than its factorization.

16221785880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135181563 (or 135181559 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 48.

The spelling of 16221785880 in words is "sixteen billion, two hundred twenty-one million, seven hundred eighty-five thousand, eight hundred eighty".