421538111 has 2 divisors, whose sum is σ = 421538112. Its totient is φ = 421538110.

The previous prime is 421538107. The next prime is 421538141. The reversal of 421538111 is 111835124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421538111 - 2² = 421538107 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421538101) 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, 210769055 + 210769056.

It is an arithmetic number, because the mean of its divisors is an integer number (210769056).

Almost surely, 2^421538111 is an apocalyptic number.

421538111 is a deficient number, since it is larger than the sum of its proper divisors (1).

421538111 is an equidigital number, since it uses as much as digits as its factorization.

421538111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 26.

The square root of 421538111 is about 20531.3933039139. The cubic root of 421538111 is about 749.8003089101.

The spelling of 421538111 in words is "four hundred twenty-one million, five hundred thirty-eight thousand, one hundred eleven".