421642471 has 4 divisors (see below), whose sum is σ = 443834200. Its totient is φ = 399450744.

The previous prime is 421642469. The next prime is 421642511. The reversal of 421642471 is 174246124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421642471 - 2¹ = 421642469 is a prime.

It is a super-3 number, since 3×421642471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421642421) 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 in 3 ways as a sum of consecutive naturals, for example, 11095836 + ... + 11095873.

It is an arithmetic number, because the mean of its divisors is an integer number (110958550).

Almost surely, 2^421642471 is an apocalyptic number.

421642471 is a deficient number, since it is larger than the sum of its proper divisors (22191729).

421642471 is a wasteful number, since it uses less digits than its factorization.

421642471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22191728.

The product of its digits is 10752, while the sum is 31.

The square root of 421642471 is about 20533.9346205251. The cubic root of 421642471 is about 749.8621797127.

Adding to 421642471 its reverse (174246124), we get a palindrome (595888595).

The spelling of 421642471 in words is "four hundred twenty-one million, six hundred forty-two thousand, four hundred seventy-one".