42583421 has 2 divisors, whose sum is σ = 42583422. Its totient is φ = 42583420.

The previous prime is 42583381. The next prime is 42583423. The reversal of 42583421 is 12438524.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29702500 + 12880921 = 5450^2 + 3589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42583421 is a prime.

Together with 42583423, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2580905 and since 42583421 and 2580905 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 (42583423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21291710 + 21291711.

It is an arithmetic number, because the mean of its divisors is an integer number (21291711).

Almost surely, 2^42583421 is an apocalyptic number.

It is an amenable number.

42583421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42583421 is an equidigital number, since it uses as much as digits as its factorization.

42583421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 29.

The square root of 42583421 is about 6525.5973672914. The cubic root of 42583421 is about 349.2047823489.

The spelling of 42583421 in words is "forty-two million, five hundred eighty-three thousand, four hundred twenty-one".