542366221 has 2 divisors, whose sum is σ = 542366222. Its totient is φ = 542366220.

The previous prime is 542366219. The next prime is 542366261. The reversal of 542366221 is 122663245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319908996 + 222457225 = 17886^2 + 14915^2 .

It is a cyclic number.

It is not a de Polignac number, because 542366221 - 2¹ = 542366219 is a prime.

It is a super-2 number, since 2×542366221² = 588322235363641682, which contains 22 as substring.

Together with 542366219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542366261) 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 as a sum of consecutive naturals, namely, 271183110 + 271183111.

It is an arithmetic number, because the mean of its divisors is an integer number (271183111).

Almost surely, 2^542366221 is an apocalyptic number.

It is an amenable number.

542366221 is a deficient number, since it is larger than the sum of its proper divisors (1).

542366221 is an equidigital number, since it uses as much as digits as its factorization.

542366221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 542366221 is about 23288.7573949320. The cubic root of 542366221 is about 815.5129800228.

The spelling of 542366221 in words is "five hundred forty-two million, three hundred sixty-six thousand, two hundred twenty-one".