54207221 has 4 divisors (see below), whose sum is σ = 55016352. Its totient is φ = 53398092.

The previous prime is 54207191. The next prime is 54207229. The reversal of 54207221 is 12270245.

It is a happy number.

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 54207221 - 2⁶ = 54207157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54207229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404465 + ... + 404598.

It is an arithmetic number, because the mean of its divisors is an integer number (13754088).

Almost surely, 2^54207221 is an apocalyptic number.

It is an amenable number.

54207221 is a deficient number, since it is larger than the sum of its proper divisors (809131).

54207221 is an equidigital number, since it uses as much as digits as its factorization.

54207221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809130.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 54207221 is about 7362.5553308617. Note that the first 3 decimals coincide. The cubic root of 54207221 is about 378.4591832073.

Adding to 54207221 its reverse (12270245), we get a palindrome (66477466).

The spelling of 54207221 in words is "fifty-four million, two hundred seven thousand, two hundred twenty-one".