16022521 has 4 divisors (see below), whose sum is σ = 16064100. Its totient is φ = 15980944.

The previous prime is 16022509. The next prime is 16022527. The reversal of 16022521 is 12522061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12522061 = 331 ⋅37831.

It can be written as a sum of positive squares in 2 ways, for example, as 1092025 + 14930496 = 1045^2 + 3864^2 .

It is a cyclic number.

It is not a de Polignac number, because 16022521 - 2⁷ = 16022393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16022527) 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 in 3 ways as a sum of consecutive naturals, for example, 20206 + ... + 20983.

It is an arithmetic number, because the mean of its divisors is an integer number (4016025).

Almost surely, 2^16022521 is an apocalyptic number.

It is an amenable number.

16022521 is a deficient number, since it is larger than the sum of its proper divisors (41579).

16022521 is an equidigital number, since it uses as much as digits as its factorization.

16022521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41578.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 16022521 is about 4002.8141350805. The cubic root of 16022521 is about 252.1023823928.

Adding to 16022521 its reverse (12522061), we get a palindrome (28544582).

The spelling of 16022521 in words is "sixteen million, twenty-two thousand, five hundred twenty-one".