16022821 has 2 divisors, whose sum is σ = 16022822. Its totient is φ = 16022820.

The previous prime is 16022791. The next prime is 16022837. The reversal of 16022821 is 12822061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14546596 + 1476225 = 3814^2 + 1215^2 .

It is a cyclic number.

It is not a de Polignac number, because 16022821 - 2⁷ = 16022693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16022792 and 16022801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16092821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8011410 + 8011411.

It is an arithmetic number, because the mean of its divisors is an integer number (8011411).

Almost surely, 2^16022821 is an apocalyptic number.

It is an amenable number.

16022821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16022821 is an equidigital number, since it uses as much as digits as its factorization.

16022821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 16022821 is about 4002.8516085411. The cubic root of 16022821 is about 252.1039558082.

Adding to 16022821 its reverse (12822061), we get a palindrome (28844882).

The spelling of 16022821 in words is "sixteen million, twenty-two thousand, eight hundred twenty-one".