16302421 has 2 divisors, whose sum is σ = 16302422. Its totient is φ = 16302420.

The previous prime is 16302401. The next prime is 16302427. The reversal of 16302421 is 12420361.

16302421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13616100 + 2686321 = 3690^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 16302421 - 2¹¹ = 16300373 is a prime.

It is a super-2 number, since 2×16302421² = 531537860922482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16302427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8151210 + 8151211.

It is an arithmetic number, because the mean of its divisors is an integer number (8151211).

Almost surely, 2^16302421 is an apocalyptic number.

It is an amenable number.

16302421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16302421 is an equidigital number, since it uses as much as digits as its factorization.

16302421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 16302421 is about 4037.6256636791. The cubic root of 16302421 is about 253.5619218321.

Adding to 16302421 its reverse (12420361), we get a palindrome (28722782).

The spelling of 16302421 in words is "sixteen million, three hundred two thousand, four hundred twenty-one".