16520221700 has 36 divisors (see below), whose sum is σ = 35901980772. Its totient is φ = 6598300800.

The previous prime is 16520221673. The next prime is 16520221787. The reversal of 16520221700 is 712202561.

It can be written as a sum of positive squares in 6 ways, for example, as 3293841664 + 13226380036 = 57392^2 + 115006^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16520221700.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54311 + ... + 189710.

Almost surely, 2^16520221700 is an apocalyptic number.

16520221700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16520221700 is an abundant number, since it is smaller than the sum of its proper divisors (19381759072).

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

16520221700 is a wasteful number, since it uses less digits than its factorization.

16520221700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244712 (or 244705 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The spelling of 16520221700 in words is "sixteen billion, five hundred twenty million, two hundred twenty-one thousand, seven hundred".