16332021 has 6 divisors (see below), whose sum is σ = 23590710. Its totient is φ = 10888008.

The previous prime is 16332013. The next prime is 16332061. The reversal of 16332021 is 12023361.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 2604996 = 3705^2 + 1614^2 .

It is not a de Polignac number, because 16332021 - 2³ = 16332013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16331985 and 16332003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16332011) 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, 907326 + ... + 907343.

It is an arithmetic number, because the mean of its divisors is an integer number (3931785).

Almost surely, 2^16332021 is an apocalyptic number.

It is an amenable number.

16332021 is a deficient number, since it is larger than the sum of its proper divisors (7258689).

16332021 is a wasteful number, since it uses less digits than its factorization.

16332021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814675 (or 1814672 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 16332021 is about 4041.2895219224. The cubic root of 16332021 is about 253.7152915877.

Adding to 16332021 its reverse (12023361), we get a palindrome (28355382).

The spelling of 16332021 in words is "sixteen million, three hundred thirty-two thousand, twenty-one".