42328421 has 2 divisors, whose sum is σ = 42328422. Its totient is φ = 42328420.

The previous prime is 42328399. The next prime is 42328427. The reversal of 42328421 is 12482324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33477796 + 8850625 = 5786^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 42328421 - 2¹⁴ = 42312037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_2566412 and since 42328421 and 2566412 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 (42328427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21164210 + 21164211.

It is an arithmetic number, because the mean of its divisors is an integer number (21164211).

Almost surely, 2^42328421 is an apocalyptic number.

It is an amenable number.

42328421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42328421 is an equidigital number, since it uses as much as digits as its factorization.

42328421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 26.

The square root of 42328421 is about 6506.0295880053. The cubic root of 42328421 is about 348.5063449707.

The spelling of 42328421 in words is "forty-two million, three hundred twenty-eight thousand, four hundred twenty-one".