421522471 has 2 divisors, whose sum is σ = 421522472. Its totient is φ = 421522470.

The previous prime is 421522457. The next prime is 421522477. The reversal of 421522471 is 174225124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421522471 - 2¹³ = 421514279 is a prime.

It is a super-3 number, since 3×421522471³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421522477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210761235 + 210761236.

It is an arithmetic number, because the mean of its divisors is an integer number (210761236).

Almost surely, 2^421522471 is an apocalyptic number.

421522471 is a deficient number, since it is larger than the sum of its proper divisors (1).

421522471 is an equidigital number, since it uses as much as digits as its factorization.

421522471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 28.

The square root of 421522471 is about 20531.0124202388. The cubic root of 421522471 is about 749.7910357099.

Adding to 421522471 its reverse (174225124), we get a palindrome (595747595).

The spelling of 421522471 in words is "four hundred twenty-one million, five hundred twenty-two thousand, four hundred seventy-one".