16143021 has 6 divisors (see below), whose sum is σ = 23317710. Its totient is φ = 10762008.

The previous prime is 16143019. The next prime is 16143041. The reversal of 16143021 is 12034161.

It is a happy number.

16143021 is a `hidden beast` number, since 1 + 614 + 30 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9455625 + 6687396 = 3075^2 + 2586^2 .

It is not a de Polignac number, because 16143021 - 2¹ = 16143019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16142985 and 16143003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16143011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 896826 + ... + 896843.

It is an arithmetic number, because the mean of its divisors is an integer number (3886285).

Almost surely, 2^16143021 is an apocalyptic number.

It is an amenable number.

16143021 is a deficient number, since it is larger than the sum of its proper divisors (7174689).

16143021 is a wasteful number, since it uses less digits than its factorization.

16143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793675 (or 1793672 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 16143021 is about 4017.8378513823. The cubic root of 16143021 is about 252.7327970986.

Adding to 16143021 its reverse (12034161), we get a palindrome (28177182).

The spelling of 16143021 in words is "sixteen million, one hundred forty-three thousand, twenty-one".