16254421 has 2 divisors, whose sum is σ = 16254422. Its totient is φ = 16254420.

The previous prime is 16254419. The next prime is 16254437. The reversal of 16254421 is 12445261.

It is a happy number.

16254421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 3651921 = 3550^2 + 1911^2 .

It is a cyclic number.

It is not a de Polignac number, because 16254421 - 2¹ = 16254419 is a prime.

Together with 16254419, it forms a pair of twin primes.

It is equal to p_1046419 and since 16254421 and 1046419 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16254451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8127210 + 8127211.

It is an arithmetic number, because the mean of its divisors is an integer number (8127211).

Almost surely, 2^16254421 is an apocalyptic number.

It is an amenable number.

16254421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16254421 is an equidigital number, since it uses as much as digits as its factorization.

16254421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 16254421 is about 4031.6771944192. The cubic root of 16254421 is about 253.3128190144.

Adding to 16254421 its reverse (12445261), we get a palindrome (28699682).

The spelling of 16254421 in words is "sixteen million, two hundred fifty-four thousand, four hundred twenty-one".