16821043201 has 4 divisors (see below), whose sum is σ = 16896474112. Its totient is φ = 16745612292.

The previous prime is 16821043189. The next prime is 16821043219. The reversal of 16821043201 is 10234012861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16821043201 - 2¹³ = 16821035009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16821043201.

It is not an unprimeable number, because it can be changed into a prime (16821043241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37715121 + ... + 37715566.

It is an arithmetic number, because the mean of its divisors is an integer number (4224118528).

Almost surely, 2^16821043201 is an apocalyptic number.

It is an amenable number.

16821043201 is a deficient number, since it is larger than the sum of its proper divisors (75430911).

16821043201 is an equidigital number, since it uses as much as digits as its factorization.

16821043201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75430910.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 16821043201 in words is "sixteen billion, eight hundred twenty-one million, forty-three thousand, two hundred one".