542421 has 12 divisors (see below), whose sum is σ = 854880. Its totient is φ = 328680.

The previous prime is 542401. The next prime is 542441. The reversal of 542421 is 124245.

It is an interprime number because it is at equal distance from previous prime (542401) and next prime (542441).

It is not a de Polignac number, because 542421 - 2⁷ = 542293 is a prime.

542421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 542394 and 542403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2641 + ... + 2838.

It is an arithmetic number, because the mean of its divisors is an integer number (71240).

2⁵⁴²⁴²¹ is an apocalyptic number.

It is an amenable number.

542421 is a deficient number, since it is larger than the sum of its proper divisors (312459).

542421 is a wasteful number, since it uses less digits than its factorization.

542421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496 (or 5493 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 542421 is about 736.4923624859. The cubic root of 542421 is about 81.5540434708.

Adding to 542421 its reverse (124245), we get a palindrome (666666).

It can be divided in two parts, 5424 and 21, that added together give a palindrome (5445).

The spelling of 542421 in words is "five hundred forty-two thousand, four hundred twenty-one".