16422121 has 2 divisors, whose sum is σ = 16422122. Its totient is φ = 16422120.

The previous prime is 16422113. The next prime is 16422139. The reversal of 16422121 is 12122461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8643600 + 7778521 = 2940^2 + 2789^2 .

It is a cyclic number.

It is not a de Polignac number, because 16422121 - 2³ = 16422113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16422521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211060 + 8211061.

It is an arithmetic number, because the mean of its divisors is an integer number (8211061).

Almost surely, 2^16422121 is an apocalyptic number.

It is an amenable number.

16422121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16422121 is an equidigital number, since it uses as much as digits as its factorization.

16422121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 16422121 is about 4052.4216216973. The cubic root of 16422121 is about 254.1809991858.

Adding to 16422121 its reverse (12122461), we get a palindrome (28544582).

The spelling of 16422121 in words is "sixteen million, four hundred twenty-two thousand, one hundred twenty-one".