54122221 has 2 divisors, whose sum is σ = 54122222. Its totient is φ = 54122220.

The previous prime is 54122219. The next prime is 54122227. The reversal of 54122221 is 12222145.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53144100 + 978121 = 7290^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 54122221 - 2¹ = 54122219 is a prime.

Together with 54122219, 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 (54122227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27061110 + 27061111.

It is an arithmetic number, because the mean of its divisors is an integer number (27061111).

Almost surely, 2^54122221 is an apocalyptic number.

It is an amenable number.

54122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

54122221 is an equidigital number, since it uses as much as digits as its factorization.

54122221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 19.

The square root of 54122221 is about 7356.7806138283. The cubic root of 54122221 is about 378.2612645602.

Adding to 54122221 its reverse (12222145), we get a palindrome (66344366).

The spelling of 54122221 in words is "fifty-four million, one hundred twenty-two thousand, two hundred twenty-one".