16342421 has 2 divisors, whose sum is σ = 16342422. Its totient is φ = 16342420.

The previous prime is 16342409. The next prime is 16342427. The reversal of 16342421 is 12424361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 28900 = 4039^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 16342421 - 2⁶ = 16342357 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16342427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8171210 + 8171211.

It is an arithmetic number, because the mean of its divisors is an integer number (8171211).

Almost surely, 2^16342421 is an apocalyptic number.

It is an amenable number.

16342421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16342421 is an equidigital number, since it uses as much as digits as its factorization.

16342421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 16342421 is about 4042.5760351538. The cubic root of 16342421 is about 253.7691342637.

Adding to 16342421 its reverse (12424361), we get a palindrome (28766782).

The spelling of 16342421 in words is "sixteen million, three hundred forty-two thousand, four hundred twenty-one".