16105634021 has 4 divisors (see below), whose sum is σ = 16106149452. Its totient is φ = 16105118592.

The previous prime is 16105633969. The next prime is 16105634071. The reversal of 16105634021 is 12043650161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12043650161 = 101 ⋅119244061.

It can be written as a sum of positive squares in 2 ways, for example, as 14997676225 + 1107957796 = 122465^2 + 33286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16105634021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16105634071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207596 + ... + 274421.

It is an arithmetic number, because the mean of its divisors is an integer number (4026537363).

Almost surely, 2^16105634021 is an apocalyptic number.

It is an amenable number.

16105634021 is a deficient number, since it is larger than the sum of its proper divisors (515431).

16105634021 is an equidigital number, since it uses as much as digits as its factorization.

16105634021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515430.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 16105634021 in words is "sixteen billion, one hundred five million, six hundred thirty-four thousand, twenty-one".