421143071 has 2 divisors, whose sum is σ = 421143072. Its totient is φ = 421143070.

The previous prime is 421143067. The next prime is 421143127. The reversal of 421143071 is 170341124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421143071 - 2² = 421143067 is a prime.

It is a super-2 number, since 2×421143071² = 354722972502622082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421143011) 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, 210571535 + 210571536.

It is an arithmetic number, because the mean of its divisors is an integer number (210571536).

Almost surely, 2^421143071 is an apocalyptic number.

421143071 is a deficient number, since it is larger than the sum of its proper divisors (1).

421143071 is an equidigital number, since it uses as much as digits as its factorization.

421143071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 421143071 is about 20521.7706594728. The cubic root of 421143071 is about 749.5660132187.

Adding to 421143071 its reverse (170341124), we get a palindrome (591484195).

The spelling of 421143071 in words is "four hundred twenty-one million, one hundred forty-three thousand, seventy-one".