16440110021 has 4 divisors (see below), whose sum is σ = 16483488000. Its totient is φ = 16396732044.

The previous prime is 16440110009. The next prime is 16440110023. The reversal of 16440110021 is 12001104461.

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 16440110021 - 2⁶ = 16440109957 is a prime.

It is a super-3 number, since 3×16440110021³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16440109975 and 16440110002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440110023) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21688421 + ... + 21689178.

It is an arithmetic number, because the mean of its divisors is an integer number (4120872000).

Almost surely, 2^16440110021 is an apocalyptic number.

It is an amenable number.

16440110021 is a deficient number, since it is larger than the sum of its proper divisors (43377979).

16440110021 is an equidigital number, since it uses as much as digits as its factorization.

16440110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43377978.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 16440110021 its reverse (12001104461), we get a palindrome (28441214482).

The spelling of 16440110021 in words is "sixteen billion, four hundred forty million, one hundred ten thousand, twenty-one".