42421811 has 2 divisors, whose sum is σ = 42421812. Its totient is φ = 42421810.

The previous prime is 42421801. The next prime is 42421823. The reversal of 42421811 is 11812424.

42421811 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 is a cyclic number.

It is not a de Polignac number, because 42421811 - 2²² = 38227507 is a prime.

It is a super-2 number, since 2×42421811² = 3599220097039442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42421801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210905 + 21210906.

It is an arithmetic number, because the mean of its divisors is an integer number (21210906).

Almost surely, 2^42421811 is an apocalyptic number.

42421811 is a deficient number, since it is larger than the sum of its proper divisors (1).

42421811 is an equidigital number, since it uses as much as digits as its factorization.

42421811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 23.

The square root of 42421811 is about 6513.2028219609. The cubic root of 42421811 is about 348.7624620958.

The spelling of 42421811 in words is "forty-two million, four hundred twenty-one thousand, eight hundred eleven".