16021231 has 2 divisors, whose sum is σ = 16021232. Its totient is φ = 16021230.

The previous prime is 16021193. The next prime is 16021261. The reversal of 16021231 is 13212061.

It is a strong prime.

It is an emirp because it is prime and its reverse (13212061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16021231 - 2¹⁷ = 15890159 is a prime.

It is a super-2 number, since 2×16021231² = 513359685510722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16021261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010615 + 8010616.

It is an arithmetic number, because the mean of its divisors is an integer number (8010616).

Almost surely, 2^16021231 is an apocalyptic number.

16021231 is the 2532-nd centered pentagonal number.

16021231 is a deficient number, since it is larger than the sum of its proper divisors (1).

16021231 is an equidigital number, since it uses as much as digits as its factorization.

16021231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 16021231 is about 4002.6529952021. The cubic root of 16021231 is about 252.0956164829.

Adding to 16021231 its reverse (13212061), we get a palindrome (29233292).

The spelling of 16021231 in words is "sixteen million, twenty-one thousand, two hundred thirty-one".