16105421 has 2 divisors, whose sum is σ = 16105422. Its totient is φ = 16105420.

The previous prime is 16105387. The next prime is 16105447. The reversal of 16105421 is 12450161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10048900 + 6056521 = 3170^2 + 2461^2 .

It is a cyclic number.

It is not a de Polignac number, because 16105421 - 2²² = 11911117 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16105393 and 16105402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16105721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8052710 + 8052711.

It is an arithmetic number, because the mean of its divisors is an integer number (8052711).

Almost surely, 2^16105421 is an apocalyptic number.

It is an amenable number.

16105421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16105421 is an equidigital number, since it uses as much as digits as its factorization.

16105421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 16105421 is about 4013.1559899909. The cubic root of 16105421 is about 252.5364245071.

Adding to 16105421 its reverse (12450161), we get a palindrome (28555582).

The spelling of 16105421 in words is "sixteen million, one hundred five thousand, four hundred twenty-one".