542221 has 4 divisors (see below), whose sum is σ = 559744. Its totient is φ = 524700.

The previous prime is 542219. The next prime is 542237. The reversal of 542221 is 122245.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 542221 - 2¹ = 542219 is a prime.

It is a super-2 number, since 2×542221² = 588007225682, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

542221 is a lucky number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 542195 and 542204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8715 + ... + 8776.

It is an arithmetic number, because the mean of its divisors is an integer number (139936).

2⁵⁴²²²¹ is an apocalyptic number.

It is an amenable number.

542221 is a deficient number, since it is larger than the sum of its proper divisors (17523).

542221 is a wasteful number, since it uses less digits than its factorization.

542221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17522.

The product of its digits is 160, while the sum is 16.

The square root of 542221 is about 736.3565712343. The cubic root of 542221 is about 81.5440187767.

Adding to 542221 its reverse (122245), we get a palindrome (664466).

The spelling of 542221 in words is "five hundred forty-two thousand, two hundred twenty-one".