16213581220 has 24 divisors (see below), whose sum is σ = 35840548800. Its totient is φ = 6144093792.

The previous prime is 16213581217. The next prime is 16213581259. The reversal of 16213581220 is 2218531261.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21333280 + ... + 21334039.

It is an arithmetic number, because the mean of its divisors is an integer number (1493356200).

Almost surely, 2^16213581220 is an apocalyptic number.

16213581220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16213581220 is an abundant number, since it is smaller than the sum of its proper divisors (19626967580).

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

16213581220 is a wasteful number, since it uses less digits than its factorization.

16213581220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42667347 (or 42667345 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 16213581220 in words is "sixteen billion, two hundred thirteen million, five hundred eighty-one thousand, two hundred twenty".