421544542 has 16 divisors (see below), whose sum is σ = 637632000. Its totient is φ = 209005600.

The previous prime is 421544533. The next prime is 421544549. The reversal of 421544542 is 245445124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421544549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342384 + ... + 343612.

It is an arithmetic number, because the mean of its divisors is an integer number (39852000).

Almost surely, 2^421544542 is an apocalyptic number.

421544542 is a deficient number, since it is larger than the sum of its proper divisors (216087458).

421544542 is a wasteful number, since it uses less digits than its factorization.

421544542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531.

The product of its digits is 25600, while the sum is 31.

The square root of 421544542 is about 20531.5499171397. The cubic root of 421544542 is about 749.8041218838.

Adding to 421544542 its reverse (245445124), we get a palindrome (666989666).

The spelling of 421544542 in words is "four hundred twenty-one million, five hundred forty-four thousand, five hundred forty-two".