16102021 has 8 divisors (see below), whose sum is σ = 17469144. Its totient is φ = 14753280.

The previous prime is 16102013. The next prime is 16102027. The reversal of 16102021 is 12020161.

It can be written as a sum of positive squares in 4 ways, for example, as 5013121 + 11088900 = 2239^2 + 3330^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16102021 - 2³ = 16102013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 16101992 and 16102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16102027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2740 + ... + 6301.

It is an arithmetic number, because the mean of its divisors is an integer number (2183643).

Almost surely, 2^16102021 is an apocalyptic number.

It is an amenable number.

16102021 is a deficient number, since it is larger than the sum of its proper divisors (1367123).

16102021 is a wasteful number, since it uses less digits than its factorization.

16102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9191.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 16102021 is about 4012.7323608733. The cubic root of 16102021 is about 252.5186523489.

Adding to 16102021 its reverse (12020161), we get a palindrome (28122182).

The spelling of 16102021 in words is "sixteen million, one hundred two thousand, twenty-one".