54115221 has 4 divisors (see below), whose sum is σ = 72153632. Its totient is φ = 36076812.

The previous prime is 54115207. The next prime is 54115223. The reversal of 54115221 is 12251145.

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 not a de Polignac number, because 54115221 - 2¹¹ = 54113173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54115223) 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, 9019201 + ... + 9019206.

It is an arithmetic number, because the mean of its divisors is an integer number (18038408).

Almost surely, 2^54115221 is an apocalyptic number.

It is an amenable number.

54115221 is a deficient number, since it is larger than the sum of its proper divisors (18038411).

54115221 is a wasteful number, since it uses less digits than its factorization.

54115221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18038410.

The product of its digits is 400, while the sum is 21.

The square root of 54115221 is about 7356.3048468644. The cubic root of 54115221 is about 378.2449561447.

Adding to 54115221 its reverse (12251145), we get a palindrome (66366366).

The spelling of 54115221 in words is "fifty-four million, one hundred fifteen thousand, two hundred twenty-one".